Buku Teks
Djanti Virantika, author
2015
UI - Skripsi (Membership)
Kissell, Thomas E.
Prentice Hall International, 1997
Buku Teks
McCormick, Ernest J. (Ernest James), author
Prentice-Hall, 1980
Buku Teks
Toynbee, Arnold J., author
The Beacon Press , 1961
Buku Teks