Tubbs, Stewart L., author
Random House, 1974
Buku Teks
Ellis, Roger B., author
Churchill Livingstone, 2004
Buku Teks
Huseman, Richard C., author
Allyn and Bacon, 1977
Buku Teks
McIntosh, Perry, author
[American Management Association;, ], 2008
eBooks
West, Richard L.
Wadsworth/Clengage Learning , 2011
Buku Teks