Leung, Yuen-Sani
University of Hawai Press, 1990
Buku Teks
Weinberg, Meyer
Prentice Hall Inc., 1965
Buku Teks
Plamenatz, John
Longman, 1991
Buku Teks
Altschuler, Bruce E., author
Prentice-Hall, 1996
Buku Teks
Bell, Robert R.
Prentice Hall Inc., 1966
Buku Teks