Levinson, Harry
The exceptional executive a psychological conception
Harvard University Press, 1971
 Buku Teks
Psychological assessment
American Psychological Association, 1997
 Majalah, Jurnal, Buletin
Gallagher, Richard S.
Great customer connections: simple psychological techniques that guarantee exceptional service
American Management Association, 2006
 eBooks
Aiken, Lewis R.
Psychological testing and assessment
Allyn and Bacon, 1997
 Buku Teks
Psychological assessment in medical rehabilitation
edited by Laura A. Cushman and Marcia J. Scherer
American Psychological Association, 1995
 Buku Teks