Hamilton, David
Random House, 1968
Buku Teks
Harrington, Michael
Penguin Books, 1981
Buku Teks
Schiller, Bradley R., author
Prentice-Hall, 1989
Buku Teks
Perlman, Richard, author
McGraw-Hill , 1976
Buku Teks
edited by Robert M. MacIver
Institute for Religious and Social Studies, 1965
Buku Teks