Allport, Gordon W., author
New Haven, Conn. Yale Univesity Press 1963,
Buku Teks
Wharley, W. Gordon
Harper & Row, 1964
Buku Teks
Hewes, Gordon W.
Burgess Pub. Co., 1973
Buku Teks
Kathe Schneider, editor
[Springer, ], 2012
eBooks
edited by Bettina P. Reimann
Nova Biomedical Books, 2007
Buku Teks