Woodward, Bob
Simon and Schuster, 1979
Buku Teks
edited by Alan F. Westin
W.W. Norton, 1961
Buku Teks
Schwartz, Bernard
The Ronald Press, 1957
Buku Teks
Schwartz, Bernard
Oxford University Press, 1996
Buku Teks
Clayton, James E.
E.P. Dutton, 1964
Buku Teks