Sari Wahyuni, author
Penerbit Salemba Empat, 2011
Buku Teks
Schunk, Dale H., author
Prentice-Hall, 1996
Buku Teks
United Nations , [date of publication not identified]
Buku Teks
Psychology Press, 2004
Buku Teks
Azy Barak, editor
Cambridge University Press, 2008
Buku Teks