Artikel Jurnal
Hirsch, Eric Donald, Jr., author
Schwartz Publishing, 1988
Buku Teks
Hirsch, Eric Donald, Jr., author
Sidney Schwartz, 1988
Buku Teks
Tobias, Jeffrey
Bloomsbury , 1995
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Orlov, Darlene, author
[American Management Association;, ], 1999
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