Griffin, Ricky W.
Prentice-Hall, 2002
Buku Teks
Crego, Edwin T.
[American Management Association;, ], 1995
eBooks
Straub, Joseph T.
Kent, 1985
Buku Teks
Madura, Jeff
South-Western College, 2001
Buku Teks
Ebert, Ronald J.
Prentice-Hall, 1998
Buku Teks