Lawson II, Joseph W. R., author
American Management Association;;, 1998
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Arthur, Diane, author
[American Management Association;, ], 2001
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edited by Jack Pinkowski
CRC Press, Taylor & Francis Group, 2008
Buku Referensi
U.S. Department of Health Human Services, 1988
Buku Teks
Caeilli, William, author
Macmillan, 1991
Buku Teks