edited by Roodney A. Ellis
Routledge, Taylor & Francis Group, 2009
Buku Teks SO
Lewis, Dana K.
Sage publications, 1981
Buku Teks SO
edited by Johnny L. Matson
Springer, 2012
eBooks
Huberty, Thomas J.
Springer, 2012
eBooks
edited by Robert T. Ammerman and Michel Hersen
John Wiley & Sons, 1997
Buku Teks SO