Kowalski, Robert
Elsevier, 1979
Buku Teks
Hogger, Christopher John, author
Academic Press, 1984
Buku Teks
Grogono, Peter, author
Addison-Wesley, 1982
Buku Teks
Minto, Barbara, author
Minto International , 1996
Buku Teks
Robertson, S. Ian, author
Psychology Press, 2001
Buku Teks