Arnold, William R., author
Houghton Mifflin, 1983
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
Trojanowicz, Robert C., 1941-, author
Prentice-Hall, 1992
Buku Teks
Kaplan, Howard B., author
Sage Publications, 1984
Buku Teks