Hodgson, Godfrey
Vintage Books, 1976
Buku Teks
Whitmire, Richard, author
Amacom, 2010
Buku Teks
Whitmire, Richard, author
[American Management Association, ], 2010
eBooks
Baker, Ross K., author
Free Press, 1980
Buku Teks
Marsden, John
Macmillan, 1996
Buku Teks