bt Peter Banister ... [and others]
Open University Press, 2006
Buku Teks
edited by Michael Eid and Ed Diener
American Psychological Association, 2006
Buku Teks
Moustakas, Clark E.
Sage Publications, 1994
Buku Teks
Shaughnessy, John J., author
McGraw-Hill, 1997
Buku Teks
Shaughnessy, John J., author
McGraw-Hill, 2003
Buku Teks