Pennings, Paul
Sage Publications, 1999
Buku Teks
Le Roy, Michael K., author
Wadsworth and Cengage Learning, 2013
Buku Teks
Coolican, Hugh, author
Psychology Press, 2014
Buku Teks
Coolican, Hugh, author
Hodder & Stoughton, 2009
Buku Teks
Le Roy, Michael K., author
Wadsworth, 2009
Buku Teks