Grossman, Julius, author
Allyn and Bacon, 1991
Buku Referensi
Shinn, George
Gregg Division, McGraw-Hill, 1982
Buku Teks
Eccher, Clint, author
Charles River Media, 2002
Buku Teks
Bacon, Terry R., 1947-
[American Management Association;, ], 1999
eBooks
Robeson, James F., author
Richard D. Irwin , 1978
Buku Teks