Man and philosophy: German opinion on problems of today
editor, Walter Leifer
Max Hueber verlag, Muchen, 1964
 Buku Teks
Man and man: the Social Philosophers
edited by Saxe Commins and Robert N. Linscott
Modern Pocket Library, 1947
 Buku Teks
Russell, Bertrand, 1872-1970
The problems of philosophy
Oxford University Press, 1912
 Buku Teks
Taylor, A.E. (Alfred Edward), 1869-1945
Plato the man and his work
University Paperbacks, 1960
 Buku Teks
What is a man / Eric Lucas (editor)
Oxford University Press, 1962
 Buku Teks