Carroll, Janell L.
Thomson Wadsworth, 2007
Buku Teks
Rathus, Spencer A.
Allyn and Bacon, 1993
Buku Teks
Kelly, Gery F.
McGraw-Hill, Higher Education, 2008
Buku Teks
New York and London, 1994
Buku Teks
Cameron, Deborah
Cambridge University Press, 2004
Buku Teks