Bracher, Karl Dietrich, 1922
Washington Praeger , 1970
Buku Teks
Harrigan, John J.
Little, Brown & Co., 1984
Buku Teks
Acemoglu, Daron, author
Cambridge University Press, 2006
Buku Teks
Skidmore, Monique, author
ANU E Press, 2008
Buku Teks
Friedrich, Carl J., author
Prederick A. Praeger, 1965
Buku Teks