Grinnell, Richard M., author
F.E. Peacock Publishers, 2001
Buku Teks
Shaw, Ian, author
Sage, 2001
Buku Teks
Neuman, William Lawrence, 1950-, author
Allyn and Bacon, 2003
Buku Teks
Punch, Keith F., author
SAGE Publications, 1998
Buku Teks
Neuman, William Lawrence, 1950-, author
Allyn and Bacon, 1994
Buku Teks