Trojanowicz, Robert C., 1941-, author
Prentice-Hall, 1987
Buku Teks
Arnold, William R., author
Houghton Mifflin, 1983
Buku Teks
Lawrence, Richard, author
Sage, 2008
Buku Teks
Burfeind, James W. , author
Jones and Bartlett Publishers, 2011
Buku Teks
David W. Springer, Albert R. Roberts, editor
Jones and Bartlett Publishers, 2011
Buku Teks