
Source: 1920s, The Future of an Illusion (1927), Ch. 3
Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 498.
Source: 1920s, The Future of an Illusion (1927), Ch. 3
Race: Science and Politics [1940], ch. 2
p. vi http://books.google.com/books?id=h7JT-QDuAHoC&pg=PR6, as cited in: Patricia R. Allaire and Robert E. Bradley. " Symbolical algebra as a foundation for calculus: DF Gregory's contribution http://poncelet.math.nthu.edu.tw/disk5/js/history/gregory.pdf." Historia Mathematica 29.4 (2002): p. 409.
Examples of the processes of the differential and integral calculus, (1841)
Source: "Does the history of psychology have a future?." 1994, p. 469
From Hawking's article A Brief History of Relativity http://www.time.com/time/magazine/article/0,9171,993018-6,00.html, in Time magazine (31 December 1999)