University of Buffalo, 1950
Buku Teks
Cohen, Morris R., author
Free Press, 1954
Buku Teks SO
Yale University Press , 1950
Buku Teks
basic texts selected and edited with prefaces by Walter Kaufmann
Prentice-Hall, 1961
Buku Teks
edited by Maurice Mandelbaum, Francis W. Gramlich, and Alan Ross Anderson
Macmillan, 1957
Buku Teks