Manktelow, Ken
East Sussex Psychology Press , 1999
Buku Teks
Brudney, Kent M., author
Thomson, 2003
Buku Teks
edited by Keith J. Holyoak, Robert G. Morrison
Cambridge University Press, 2005
Buku Referensi
Smith-Stoner, Marilyn, author
Lippincott, 1999
Buku Teks
Chapman and Hall/CRC, 2007
eBooks