Ghillyer, Andrew W., author
McGGraw-Hill Higher education, 2008
Buku Teks
Weiss, Joseph, author
Wadsworth, 2009
Buku Teks
Weiss, Joseph W., author
Berrett-Koehler, 2014
Buku Teks
New York, N.Y. , Prentice Hall 1994
Buku Teks
Hodges, Luther H., author
Prentice-Hall, 1963
Buku Teks