Badan Pusat Statistik, 2013
Multimedia
George S. Cuhaj, editor
Krause, 2011
Buku Referensi
Krol, Ed, author
O`Reilly and Associates, 1992
Buku Teks
Campbell, James, author
University of Illinois Press, 1992
Buku Teks
Miller, Ronald B., 1948-, author
American Psychological Association, 2015
Buku Teks