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