Bates, Kristin A., author
Sage, 2014
Buku Teks
Burfeind, James W. , author
Jones and Bartlett Publishers, 2011
Buku Teks
Arnold, William R.
Houghton Mifflin, 1983
Buku Teks
Arnold, William R., author
Houghton Mifflin, 1983
Buku Teks
Shaw, Clifford R.
University of Chicago, 1969
Buku Teks