Lamont, Corliss
Philosophical Library, 1952
Buku Teks
Oxford University Press, 1951
Buku Teks
Fischer, George
Harvard University Press, 1952
Buku Teks
edited by Alexander Dallin, Gail W. Lapidus
Westerview Press, 1991
Buku Teks
Frederick A, Praeger; George Allen and Unwin Ltd., 1964
Buku Teks