John Wiley & Sons, 2003
Buku Teks SO
Morgan, David
International Engineering Consortium, 2007
eBooks
editor, John G. Webster
CRC Press, 1999
Buku Referensi
Morgan, David
Peter Peregrinus, 1996
Buku Referensi
by Gordon W. Allport ... [et al.]; edited by Gardner Lindzey
Addison-Wesley, 1956
Buku Teks