Kumar, Rajesh, author
Academic Press, 2016
Buku Teks
edited by Kathleen J. Bieschke, Ruperto M. Perez, Kurt A. DeBord
American Psychological Association, 2007
Buku Referensi
Corey, Gerald, author
Refika Aditama , 2003
Buku Teks
Leininger, Madeleine M., author
A Wiley Medical Publication, 1978
Buku Teks
edited by Rainer Bauböck, Thomas Faist
Amsterdam University Press, 2010
Buku Teks