Aamodt, Michael G., author
Thomson/Wadsworth, 2004
Buku Teks
Feinberg, Mortimer R.
Prentice-Hall, 1965
Buku Teks
Ashar Sunyoto Munandar, author
UI-Press, 2001
Buku Teks
edited by P.J.D. Drenth ... [and others]
John Wiley & Sons, 1984
Buku Referensi
Furnham, Adrian, author
Psychology Press, 2002
Buku Teks