Hogger, Christopher John
Academic Press, 1984
Buku Teks
Grogono, Peter
Addison-Wesley, 1982
Buku Teks
Minto, Barbara
Minto International , 1996
Buku Teks
Robertson, S. Ian
Psychology Press, 2001
Buku Teks
Rubinstein, Moshe F.
Prentice-Hall, 1975
Buku Teks