Gorton, Richard A.
McGraw-Hill, 2012
Buku Teks
Gorlewski, Julie A.
Sense, 2012
eBooks
Morphet, Edgar L. (Edgar Leroy), 1895-
Prentice-Hall, 1982
Buku Teks
Krames, Jeffrey A.
Gramedia Pustaka Utama, 2005
Buku Teks
Jennings, Marianne Moody
South-Western, 2009
Buku Teks