
Martin Luther as quoted in Tappert, Theodore G. (1959). The Book of Concord: the Confessions of the Evangelical Lutheran Church. Philadelphia: Fortress Press, p. 595
Letter to a Roman Catholic, July 18, 1749, The works of the Rev. John Wesley (1872), London, Wesleyan Conference Office, vol. X, p. 81. https://books.google.com/books?id=TZBKAAAAYAAJ&pg=PA81&dq=%22continued+a+pure+and+unspotted+virgin%22&hl=en&sa=X&ved=0ahUKEwjn7srt5I_NAhUUU1IKHUlzC-AQ6AEIUTAH#v=onepage&q=%22continued%20a%20pure%20and%20unspotted%20virgin%22&f=false
General sources
Martin Luther as quoted in Tappert, Theodore G. (1959). The Book of Concord: the Confessions of the Evangelical Lutheran Church. Philadelphia: Fortress Press, p. 595
Zwingli Opera, Corpus Reformatorum, Volume 1, p. 424.
The Precious and Sacred Writings of Martin Luther (1905) edited by John Nicholas Lenker; republished as Sermons of Martin Luther (1996), p. 291
As quoted in Anderson, H. George; Stafford, J. Francis; Burgess, Joseph A., eds. (1992). The One Mediator, The Saints, and Mary. Lutherans and Catholics in Dialogue. VIII. Minneapolis: Augsburg. ISBN 0-8066-2579-1., p. 236
D. Martin Luthers Werke, Kritische Gesamtausgabe, 61 vols., (Weimar: Verlag Hermann Böhlaus Nochfolger, 1883-1983), 52:39 [hereinafter: WA] 1544
"Encyclical Letter of Our Holy Father Pius X" in The American Catholic Quarterly Review, Vol. 29. No. 114 (April 1904) p. 211
In Mary for Earth and Heaven: Essays on Mary and Ecumenism http://books.google.com/books?id=Dx4WrfzZMsoC&pg=PA116&dq=%22it+was+fitting+that+the+virgin+should+be+radiant+with+a+purity+so+great%22&hl=en&ei=ELNATrLoCIXMsQLbsvmuCQ&sa=X&oi=book_result&ct=result&resnum=1&sqi=2&ved=0CCoQ6AEwAA#v=onepage&q=%22it%20was%20fitting%20that%20the%20virgin%20should%20be%20radiant%20with%20a%20purity%20so%20great%22&f=false, 2002, William McLaughlin, Jill Pinnock, eds., Gracewing, ISBN 0852445563 ISBN 9780852445563pp. 115-116.
The Tragic Sense of Life (1913), VIII : From God to God
The Tragic Sense of Life (1913), VIII : From God to God