Edited by Dagobert D. Runes
Philosophical Library, 1947
Buku Teks
Mayer, Frederick
American Book Company, 1951
Buku Teks
Mayer, Frederick
American Book Company, 1951
Buku Klasik
edited by A.P. Martinich
Blackwell, 2007
Buku Teks
Castell, Alburey
Macmillan, 1959
Buku Teks