Magruder, Frank Abbott
Allyn and Bacon, 1939
Buku Teks
Graham, Malbone W.
Johns Hopkins Press, 1948
Buku Teks
edited by Lawrence E. Harrison, Samuel P. Huntington
Basic Books, 2000
Buku Teks
Liska Dharma Kusuma, author
2016
UI - Skripsi (Membership)
Krugman, Paul R., author
Pearson Education , 2014
Buku Teks