Fletcher, Ben (c)
John Wiley & Sons, 1991
Buku Teks
Boenisch, author
Grasindo, 2004
Buku Teks
Sage Publications, 2009
eBooks
edited by Tim Dalgleish and Mick Power
John Wiley & Sons, 2000
Buku Teks
edited by Robert S. Wyer and Thomas K. Srull
Hillsdale, New Jersey, 1994
Buku Teks