LeRoy, Stephen F., author
Cambridge University Press, 2014
Buku Teks
Torr, Christopher, author
Westview Press, 1988
Buku Teks
Smith, Buford
McGraw-Hill Company, 1963
Buku Teks
Haywood, R.W. (Richard Wilson), author
J. Wiley, 1980
Buku Teks
Universitas Indonesia, 2014
UI - Skripsi (Membership)