George Kubler summarizing the view of Meyer Schapiro (with whom he disagrees), quoted by Alpers in Lang, Berel (ed.), The Concept of Style, 1987, Ithaca: Cornell University Press, ISBN 0801494397
Quotes about principal
page 3
Stephen A. Ross "The Economic Theory of Agency: The Principal's Problem," Amer. Econom. Rev., 63 (1973), 134-139; As cited in Eisenhardt (1985, 136)

“Light, God's eldest daughter, is a principal beauty in a building.”
Of Building.
The Holy State and the Profane State (1642)

The Soldier's Load and the Mobility of a Nation (1950)

RODIN, AUGUSTE. L'Art. Entretiens réunis par Paul Gsell, 1911

Source: 1930s, On my Painting (1938), p. 16

Stig Toft Madsen, et al, in: Trysts with Democracy: Political Practice in South Asia http://books.google.co.in/books?id=6w7JVOlDIokC&pg=PA80, Anthem Press, 2011, P.80
Source: The Coming Community (1993), Ch. 18 : Shekinah

Source: Mathematical Lectures (1734), p. 27-30

in his Nobel Lecture http://nobelprize.org/nobel_prizes/physics/laureates/2000/kroemer-lecture.html, Quasi-Electric Fields and Band Offsets: Teaching Electrons New Tricks, 8 December 2000, at Aula Magna, Stockholm University.
Source: "Theory of the firm: Managerial behavior, agency costs and ownership structure", 1976, p. 308-9

"America First? America Last? America at Last?," Lowell Lecture, Harvard University (20 April 1992).
1990s

Source: Persons and Places (1944), p. 14

in a letter to David Croal Thomson (1907), as cited in: The Brothers Maris (James – Matthew – William), ed. Charles Holme; text: D.C. Thomson https://ia800204.us.archive.org/1/items/cu31924016812756/cu31924016812756.pdf; publishers, Offices of 'The Studio', London - Paris, 1907, p. BMxv

“The Danger Threatening Representative Government” Speech (1897) http://www.wisconsinhistory.org/pdfs/lessons/EDU-SpeechTranscript-SpeechesLaFollette-DangerThreatening.pdf

“The principal might yield a greater sum,
Yet handled ill, amounts but to this crumb;”
To Her Father with Some Verses.

As quoted in "Donald Tsang unveils new HKSAR gov't lineup" at Xinhua News (23 June 2007) http://news.xinhuanet.com/english/2007-06/23/content_6281710.htm

Variant: A self -idea of this sort seems to have three principal elements: the imagination of our appearance to the other person; the imagination of his judgment of that appearance, and some sort of self-feeling, such as pride or mortification.
Source: Human Nature and the Social Order, 1902, p. 182 (1922)

Report of the Superintendent of the New York and Erie Railroad to the Stockholders (1856)

Quote in a writing of Jorn on modern art in Paris, 1947; as cited on the website of the Jorn Museum. 'Articles' by Jorn http://www.museumjorn.dk/en/article_presentation.asp?AjrDcmntId=255,
1940 - 1948, Various sources

Gopal Bhargava in: Child Labour http://books.google.co.in/books?id=6iYmX2k6G-MC&pg=PA96, Gyan Publishing House, 1 January 2003, P.96

Pedagogia do oprimido (Pedagogy of the Oppressed) (1968, English trans. 1970)

Source: Art applied to industry: a series of lectures, 1865, p. 8-9; Partly cited in: Journal of the Royal Society of Arts. Vol. 99. 1951. p. 520
Source: How Europe Underdeveloped Africa (1972), p. 314.

Collected Works, Vol. 24, pp. 42–54.
Collected Works
“Here in this seat, I will not say yes to anybody performing karaoke. It is a principal issue.”
Quotes from him, Csillag születik (talent show between 2011-2012)
Hindu Temples – What Happened to Them, Volume II (1993)
"Depicting Europe", London Review of Books (20 September 2007)

S.R. Goel, (1994) Heroic Hindu resistance to Muslim invaders, 636 AD to 1206 AD. ISBN 9788185990187 , quoting Ram Gopal Misra, Indian Resistance to Early Muslim Invaders Upto 1206 A.D. (1983).
Preface to the Preface
Preface to The Right To Be Greedy (1983 edition)
The Anatomy, Physiology, and Diseases of the Teeth, Philadelphia: Carey & Lea, 1830, p. 35 https://books.google.it/books?id=LK-_LIeEq2oC&pg=PA35&lpg=PA35.

A Dialogue with Utah Supreme Court Justice Thomas R. Lee https://web.archive.org/web/20150120094848/www.attorneyatlawmagazine.com/salt-lake-city/dialogue-utah-supreme-court-justice-thomas-r-lee/

Gautier, vous en irées à chiaus de Calais, et dirés au chapitainne, monsigneur Jehan de Viane, que vous avés tant travilliet pour yaus, et ossi ont tout mi baron, que je me sui accordés à grant dur à ce que la plus grant grasce qu'il poront trouver ne avoir en moy, c'est que il se partent de le ville de Calais six des plus notables bourgeois, en purs les chiés et tous, deschaus, les hars ou col, les clés de le ville et dou chastiel en leurs mains. Et de chiaus je ferai ma volonté, et le demorant je prenderai à merci.
Book 1, p. 106.
Edward III's last offer to the besieged citizens of Calais in 1347.
Chroniques (1369–1400)
Intellectual Freedom (1971)

Source: The Corporation: The Pathological Pursuit of Profit and Power (2004), Chapter 2, Business As Usual, p. 36

Source: Essays in tektology, 1980, p. xiv

empty, 'helpless'.
in a letter to David Croal Thomson (1907), as cited in: The Brothers Maris (James – Matthew – William), ed. Charles Holme; text: D.C. Thomson https://ia800204.us.archive.org/1/items/cu31924016812756/cu31924016812756.pdf; publishers, Offices of 'The Studio', London - Paris, 1907, p. BMxxxviii

A Survey of the Wisdom of God in the Creation; Or A Compendium of Natural Philosophy New York: Bangs and T. Mason, 1823, Part the Second, Chapter I, volume 1, pages 147-148. Wesley Center Online http://wesley.nnu.edu/john-wesley/a-compendium-of-natural-philosophy/chapter-1-of-beasts/
General sources
Source: Principles of management, 1968, p. 379

Source: Anti-Tech Revolution: Why and How (2016), p. 1

Multan (Punjab) . The Chach Nama, in: Elliot and Dowson, Vol. I : Elliot and Dowson, History of India as told by its own Historians, 8 Volumes, Allahabad Reprint, 1964. pp. 205-06.
Quotes from The Chach Nama

Near v. Minnesota, 283 U.S. 697 (1931).
Judicial opinions

Broadcast from London (25 September 1933), quoted in This Torch of Freedom (1935), p. 11.
1933

Source: The administrative theory in the state, 1923, p. 116

Column, March 21, 2014, " Paul Ryan was right – poverty is a cultural problem" http://www.washingtonpost.com/opinions/george-f-will-the-lefts-half-century-of-denial-over-poverty/2014/03/21/1aeaff4e-b049-11e3-a49e-76adc9210f19_story.html at washingtonpost.com.
2010s
“The light in the world comes principally from two sources,—the sun, and the student's lamp.”
Source: Intuitions and Summaries of Thought (1862), Volume II, p. 16.
Source: Truth and Truthfulness (2002), p. 18

Che cosa è il fascismo: Discorsi e polemiche (“What is Fascism?”), Florence: Vallecchi, (1925) pp. 42-45, 47-48, 49-51, 56,Origins and Doctrine of Fascism, A. James Gregor, translator and editor, Transaction Publishers, 2003, p. 63
Source: Society as a complex adaptive system (1968), p. 490.
"Two Intellectual Systems: Matter-energy and the Monetary Culture." Summary, by M. King Hubbert, of a seminar he taught at MIT Energy Laboratory, 30 September 1981, recovered from http://www.hubbertpeak.com/hubbert/monetary.htm

Letter to George Washington (24 October 1776)

1780s, Memorandum to Abolitionists (1789)

Source: "Neal Boortz - Libertarian", [http://www.theadvocates.org/celebrities.html Libertarian Celebrities & VIPs http://www.theadvocates.org/celebrities/neal-boortz.html,, Advocates for Self-Government, 2006-09-08, http://web.archive.org/20030719050508/www.theadvocates.org/celebrities/neal-boortz.html, 2003-07-19]

Letter to George Washington (November 1779)

Source: On the Study and Difficulties of Mathematics (1831), Ch. I.

"Hayek and conservatism", in Edward Feser (ed.), The Cambridge Companion to Hayek (2006)

Memorandum on Indian Policy (16 May 1946), from Simon Heffer, Like the Roman. The Life of Enoch Powell (Phoenix, 1999), pp. 104-105.
1940s

“Man only is endowed with wisdom so as to understand religion, and this is the principal if not the only difference betwixt him and dumb animals; for other things that seem peculiar to him, though they are not the same in them, yet they appear to be alike … What is there more peculiar to man than reason, and foresight? Yet there are animals which make several different ways of retiring from their dens; that when in danger they may escape; which without understanding and forethought they could not do. Others make provision for the future.”
Solus (homo) sapientia instructus est ut religionem solus intellegat, et haec est hominis atque mutorum vel praecipua, vel sola distantia; nam caetera quae videntur hominis esse propria, etsi non sint talia in mutis, tamen similia videri possunt … Quid tam proprium homini quam ratio, et providentia futuri? Atqui sunt animalia, quae latibulis suis diversos, et plures exitus pandant; ut si quod periculum inciderit, fuga pateat obsessis; quod non facerent, nisi inesset illis intelligentia, et cogitatio. Alia provident in futurum.
De Ira Dei (c. 313), Chap. VII; as quoted in Pierre Bayle, Historical and Critical Dictionary (1697), London, 1737, Vol. 4, Chap. Rorarius, p. 903 https://books.google.it/books?id=JmtXAAAAYAAJ&pg=PA903.
Shakespeare over the Port (1960)

Report of the Superintendent of the New York and Erie Railroad to the Stockholders (1856)

Source: An Essay on Friendship, 1732, pp. 54-55

Un Art de Vivre (The Art of Living) (1939), The Art of Leadership

Speech http://hansard.millbanksystems.com/commons/1929/nov/07/india in the House of Commons (7 November 1929).
1929

Source: The Province of Jurisprudence Determined (1832), p. 224

Speech http://hansard.millbanksystems.com/commons/1986/mar/18/help-for-the-unemployed in the House of Commons (18 March 1986)

Cross-correspondences (pp. 21-22)
The Immortalization Commission: The Strange Quest to Cheat Death (2011)

Speech http://hansard.millbanksystems.com/lords/1962/nov/08/britain-and-the-common-market in the House of Lords on the British application to join the Common Market (8 November 1962).
1960s

Source: The Cabinet Council (published 1658), Chapter 25
Sultãn Ahmad Shãh I of Gujrat (AD 1411-1443) Idar (Gujarat)
Tãrîkh-i-Firishta
Sultãn ‘Alî ‘Ãdil Shãh I of Bijapur (AD 1557-1579) Bankapur (Karnataka)
Tãrîkh-i-Firishta

"Opinion: Iran must confront its past to move forwards" http://www.aawsat.net/2015/02/article55341173, Ashraq Al-Awsat (February 6, 2015).
“The principal role of the mutual fund is to serve its investors.”
Princeton thesis, 1951 ( http://www.vanguard.com/bogle_site/sp20051015.htm)

Lecture 2: The Federal Reserve after World War II
The Federal Reserve and the Financial Crisis (2012)