Blackburn, Julian
Routledge & Kegan Paul, 1953
Buku Teks SO
edited by Daniel P. Kimble and Andrew M. Calman
Harlow Longman, 1995
Buku Teks
Carlson, Neil R.
Pearson-Prentice Hall, 2005
Buku Teks
edited by Henderikus J. Stam
Sage Publications, 1998
Buku Teks SO
edited by Donna Coch, Kurt W. Fischer, Geraldine Dawson
Guilford Press, 2007
Buku Teks