Sherman, Andrew J.
Amacom, 2005
Buku Teks
Maftuh Ahnan
CV. Bintang Pelajar Group, [Date of publication not identified]
Buku Referensi
Srewart, Desmond
New York : Time Incorporated, c.1962.
Buku Teks
Patai, Raphael
Hatherleigh Press, 2002
Buku Teks
Patai, Raphael
Recovery Resources Press, 2007
Buku Teks