Jex, Steve M., author
John Wiley & Sons, 2002
Buku Teks
Furnham, Adrian, author
Psychology Press, 2002
Buku Teks
Kolb, David A., author
Prentice-Hall, 1984
Buku Teks
Feinberg, Mortimer R.
Prentice-Hall, 1965
Buku Teks
edited by P.J.D. Drenth ... [and others]
John Wiley & Sons, 1984
Buku Referensi