Kristine Krapp, Editor
Thomson Gale, 2004
Buku Referensi
Surwillo, Walter W.
Ablex , 1990
Buku Teks
Philips, Beeman N.
Jassey-Bass , 1990
Buku Teks
Borgo, Mauro, author
[, Springer], 2012
eBooks
edited by Gregory A. Kimble, Michael Wertheimer, Charlotte White
American Psychological Association, 1991
Buku Teks