Carrabine, Eamonn, author
Routledge, 2009
Buku Referensi
Barkan, Steven E., author
Pearson/Prentice Hall, 2006
Buku Teks
Barkan, Steven E., author
Prentice-Hall, 2012
Buku Teks
Hagan, Frank E., author
Kencana, 2013
Buku Teks
Barlow, Hugh D.
Litle, Brown and Company, 1984
Buku Teks