New York, N.Y., National Foreman's Institute.Inc
Buku Teks
Steckle, Lynde C
Harper & Row , 1958
Buku Teks
Merrill, Harwood
New York, N.Y., American Management Association, Inc
Buku Teks
Fisher, Cynthia D., author
Houghton Mifflin, 1990
Buku Teks
Ivancevich, John M., author
Irwin, 1995
Buku Teks