Braaten, Ellen, author
Guilford Press, 2004
Buku Teks
Anastasi, Anne, author
Macmillan, 1988
Buku Teks
Aiken, Lewis R., author
Allyn and Bacon, 1997
Buku Teks
Kaplan, Robert M., author
AIPI Publication, 2007
Buku Teks
Anastasi, Anne, author
Macmillan, 1990
Buku Teks