Humphries, john
Groiler International, 1993
Buku Teks
Nicholson, John, author
BBC Books , 1992
Buku Teks
Chan, Janis Fisher, author
[American Management Association;, ], 2007
eBooks
Carter, Gregg Lee, author
[American Management Association, ], 2006
eBooks
Yourdon, Edward, author
Yourdon Inc., 1976
Buku Teks