Douglas Davies
Guilford Press, 1999
Buku Teks
Papalia, Diane E., author
McGraw-Hill, 2002
Buku Teks
Papalia, Diane E., author
Academic Internet Publishers, 2007
Buku Teks
McGraw-Hill, 1993
Buku Teks
Billman, Jean, author
Allyn and Bacon, 1997
Buku Teks