Beard, Charles A.
Prentice-Hall, 1962
Buku Teks
Fainsod, Merle
Harvard University Press, 1965
Buku Teks
Fainsod, Merle
Harvard University Press, 1956
Buku Teks
Lamparello, Adam
NY Routledge, 2017
Buku Teks
edited by Alan F. Westin
W.W. Norton, 1961
Buku Teks