Psychology Press, 1998
Buku Teks
Mennicke, C.A., author
Erven J. Bijleveld, 1948
Buku Teks
Fakultas Psikologi Universitas Indonesia, 1996
UI - Skripsi (Membership)
Wulff, David M., 1940-
Wiley, 1991
Buku Teks
edited by David A. Leeming, Kathryn Madden, Stanton Marlan
Springer, 2009
Buku Referensi