Lamont, Corliss
Philosophical Library, 1952
Buku Teks
Oxford University Press, 1951
Buku Teks
Shteppa, Konstantin F.
Rutgers University Press, 1962
Buku Teks
Frederick A, Praeger; George Allen and Unwin Ltd., 1964
Buku Teks
McCauley, Martin
Longman, 1993
Buku Teks