Pyhrr, Peter A., author
John Wiley & Sons, 1973
Buku Teks
Phyrr, Peter A.
London: John & Wiley, 1973,
Buku Teks
Chen, Ching-chin
Oryx Press , 1980
Buku Teks
edited by Pamela S. Cenzer; Cynthia I. Gozzi
The Hawork Press , 1991
Buku Teks
Beirne, Mike, author
American Management Association, 2006
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