Coico, Richard, author
Wiley Blackwell, 2015
Buku Teks
Kuby, Janis
W.H Freeman, 1992
Buku Teks
Spickett, Gavin
Oxford University Press, 1999
Buku Referensi
edited by Darla Haberer
William & Wilkins, 1997
Buku Referensi
Clark, William R., author
John Wiley & Sons, [Date of publication not identified]
Buku Teks