Okasha, Samir, editor
Oxford University Press, 2016
Buku Teks SO
Halverson, william H
Random House, 1969
Buku Teks
Luce, J.V.
Thames and Hudson , 1994
Buku Teks
Bernard, Theos
Philosopical Library , 1947
Buku Teks
edited by John Herman Randali, Justus Buchler
Barnes & Noble, 1950
Buku Teks