Scott, Gini Graham
American Management Association, 2008
eBooks
Bennie, Michael
Elex Media Komputindo, 1996
Buku Teks
Hackos, JoAnn T.
John Wiley & Sons, 1994
Buku Referensi
Putzier, John
[American Management Association;xvii, 188 pages : illustration, xvii, 188 pages : illustration], 2001
eBooks
Snover, Stephen L.
Prentice-Hall, 1982
Buku Teks SO