Sutrisno Hadi, author
Fak. Psykhologi-UGM, 1978
Buku Teks
Brause, Rita S., author
RoutledgeFalmer , 2000
Buku Teks
Maureen Ryan
Sense, 2012
eBooks
Turabian, Kate L., author
University of Chicago Press, 1996
Buku Teks
Djarwanto, author
BPFE, 1987
Buku Referensi