Furnham, Adrian, author
Psychology Press, 2002
Buku Teks
Feinberg, Mortimer R.
Prentice-Hall, 1965
Buku Teks
Siswati Prihatini, author
Universitas Indonesia, 2005
UI - Tesis (Membership)
edited by P.J.D. Drenth ... [and others]
John Wiley & Sons, 1984
Buku Referensi
Beach, Leslie R.
McGraw-Hill Book , 1959
Buku Teks