Chevallier, Arnaud, author
Oxford University Press, 2016
eBooks
Gendell, Julien, author
West Publisihing, 1993
Buku Teks
American Psychological Association, 2004
Buku Teks
Proctor, Tony
Routledge, Taylor & Francis Group, 1999
Buku Teks
Johnson, Ken, author
John Wiley & Sons, 2004
Buku Teks