Oceana Publications, Inc, 1994
Buku Teks
Schlesinger, Rudolf B.
The Foundation Press, 1950
Buku Klasik
Schlesinger, Rudolf B.
The Foundation Press, Inc., 1959
Buku Klasik
Eder, Phanor J., author
New York University press, 1950
Buku Teks
White, Irvin L., author
University of Arizona Press, 1972
Buku Teks