Blackburn, Julian, author
Kegan Paul, Trench, Trubner, 1947
Buku Teks
Blackburn, Julian, author
Routledge & Kegan Paul, 1953
Buku Teks
edited by Daniel P. Kimble and Andrew M. Calman
Harlow Longman, 1995
Buku Teks
Carlson, Neil R., author
Pearson-Prentice Hall, 2005
Buku Teks
edited by Henderikus J. Stam
Sage Publications, 1998
Buku Teks