edited by Ronan Paddison
Sage Publications, 2001
Buku Referensi
Oxford University Press, 1973
Buku Teks
Abrahamson, Mark, author
Prentice-Hall, 1980
Buku Teks
Gans, Herbert J., author
The Free Press, 1982
Buku Teks
Bish, Robert L., author
McGraw-Hill Kogakusha, 1975
Buku Teks