Gouch, J.W., author
Clarendon Press, 1950
Buku Teks
edited by John K. Ryan
The Catholic University of America Press, 1963
Buku Teks
Stumpf, Samuel Enoch, 1918-1998, author
McGraw-Hill, 1971
Buku Teks
edited by F.S.C. Northrop
Yale University Press, 1949
Buku Teks
edited by John Herman Randali, Justus Buchler
Barnes & Noble, 1950
Buku Teks