Armitge, Angus
The World of copernicus (original title: Sun, stand thou still) / Angus Armitage
The New American Library, 1956
 Buku Teks
Treasury of world philosophy
edited by Dagobert D. Runes
Littlefield, Adams & Co., 1959
 Buku Referensi
Ideological differences and world order: studies in the philosophy and science of the world's cultures
edited by F.S.C. Northrop
Yale University Press, 1949
 Buku Teks
Christensen, Kit R.
Philosophy and choice : selected readings from around the world
McGraw-Hill, 2002
 Buku Teks
The world's great thinkers: Man and Spirit; the speculative philosophers
ed. by Saxe Commins & Robert N. Linscott.
Random House , 1947
 Buku Teks