Coombs, W. Timothy, author
Wiley-Blackwell , 2012
Buku Teks
Myers, Michele Tolela, author
McGraw-Hill, 1982
Buku Teks
Ihlen, Oyvind, editor
John Wiley & Sons, 2011
eBooks
Okoye, Adaeze, author
NY Routledge, 2017
Buku Teks
edited by Klaus Fiedler
Psychology Press, 2007
Buku Teks