Katz, William A., 1924-
Holt, Rinehart and Winston, 1979
Buku Teks
Libraries Unlimited, 2000
Buku Teks
Doucett, Elisabeth
[American Management Association, ], 2008
eBooks
Singer, Paula M.
[American Management Association, ], 2009
eBooks
Lancaster, F. Wilfrid
Uninersity of Illinois, 1993
Buku Teks