Fletcher, John
Duckworth, 1973
Buku Teks
Falcone, Paul
American Management Association, 2009
eBooks
Arthur, Diane
[American Management Association, ], 2006
eBooks
Nierenberg, Alan H.
American Management Association, 2005
eBooks
Holdsworth, Roger F.
Brithis Institute of Management, 1972
Buku Teks