Wiersma, William
Allyn and Bacon , 1991
Buku Teks
Barker, Chris, author
John Wiley & Sons, 2002
Buku Teks
Agnew, Neil McK., author
Prentice-Hall, 1982
Buku Teks
Gazzaniga, Michael S., author
[publisher not identified], [date of publication not identified]
Buku Teks
Baglione, Lisa A., author
Thomson Wadsworth, 2007
Buku Teks