Farrell, Warren, author
[American Management Association, ], 2005
eBooks
Pease, Allan, author
Ufuk Press, 2006
Buku Teks
Seligman, Eustace, author
New York University Press, 1956.
Buku Teks
Hayles, V. Robert, author
McGraw-Hill , 1997
Buku Teks
Handley, John, author
American Management Association, 2005
eBooks