Fulmer, Robert M., author
American Management Association, 2008
eBooks
Parkhurst, Wiliam
Harper Business, 2000
Buku Teks
McDonald, Mlcolm, author
John Wiley & Sons, 2011
Buku Teks
Sexton, Don, author
Bhuana Ilmu Populer, 2006
Buku Teks
Elkin, A. P., author
Angus and Robertson, 1966
Buku Teks