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
Schlecht, Phillip C., 1937-
Jossey-Bass, 1997
Buku Teks