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Richard D. Irwin, 1975
Buku Teks SO
Kerin, Roger A.
The McGraw-Hill, 2003
Multimedia
Churchill, Gilbert A.
The Dryden Press, 1995
Buku Teks SO
Cateora, Philip R.
McGraw-Hill, 2005
Multimedia
Bradley, Frank
John Wiley & Sons, Ltd, 2003
Buku Teks