Feith, Herbert
Yale University , 1987
Buku Teks
Padover, Saul K. (Saul Kussiel), author
Frederick A. Praeger, 1963
Buku Teks
edited by Peter Clarke and Stewart Sutherland
Routledge, 1991
Buku Teks
Hick, John H., 1922-2012, author
Prentice-Hall, 1990
Buku Teks
edited by Vergilius Ferm
Littlefield, Adam and Co., 1959
Buku Referensi