Anastasi, Anne, author
Macmillan, 1988
Buku Teks
Anastasi, Anne, author
Macmillan, 1990
Buku Teks
Cronbach, Lee J
Harper and Row, 1970
Buku Teks
Aiken, Lewis R., author
Allyn and Bacon, 1997
Buku Teks
Braaten, Ellen, author
Guilford Press, 2004
Buku Teks