Pepall, Lynne, author
Thomson , 2005
Buku Teks
Ross, Murray G., author
Harper & Row, 1955
Buku Teks
Harms-Ringdahl, Lars, author
Taylor&Francis, 2001
Buku Teks
Frydenberg, Erica, author
Psychology Press, 2008
Buku Teks
Woodward, Joan, author
Oxford University Press, 1965
Buku Teks