Helen Beinart, Paul Kennedy, Susan Llewelyn, editor
BPS Blackwell, 2009
Buku Teks
Nietzel, Michael T., author
Prentice-Hall, 1987
Buku Teks
Kendall, Philip C., author
John Wiley & Sons, 1982
Buku Teks
Illinois, 1983
Buku Teks
Suprapti Sumarmo Markam, author
UI Press, 2003
Buku Teks