Tsanoff, Radoslav A.
The great philosophers
Harper & Brothers, 1953
 Buku Teks
Frost, S.E.
Basic teachings of the great philosophers
Barnes and Noble, 1957
 Buku Teks
Man and man: the Social Philosophers
edited by Saxe Commins and Robert N. Linscott
Modern Pocket Library, 1947
 Buku Teks
Treasury of world philosophy
edited by Dagobert D. Runes
Littlefield, Adams & Co., 1959
 Buku Referensi
Thomas, Henry
The Living world of philosophy
Blakiston, 1946
 Buku Teks