Schlesinger, Rudolf B.
The Foundation Press, 1950
Buku Klasik
Schlesinger, Rudolf B.
The Foundation Press, Inc., 1959
Buku Klasik
Eder, Phanor J.
New York University press, 1950
Buku Teks
White, Irvin L.
University of Arizona Press, 1972
Buku Teks
David, Rene, 1906-
Stevens & sons, 1985
Buku Teks