Shteppa, Konstantin F.
Rutgers University Press, 1962
Buku Teks
Lamont, Corliss
Philosophical Library, 1952
Buku Teks
Kowalski, Ronald
Routledge, 1997
Buku Teks
Oxford University Press, 1951
Buku Teks
Fischer, George
Harvard University Press, 1952
Buku Teks