DeVane, William Clyde, author
Harvard University Press, 1965
Buku Teks
Thermstern, Stephen
Cambridge, Harvard University Press
Buku Teks
Goldstein, Richard
Simon & Schuster , 1997
Buku Teks
Etzioni, Amitai, author
McGraw-Hill, 1983
Buku Teks
Buku Teks