Drucker, Peter F. (Peter Ferdinand), 1909-2005, author
Times Books International, 1985
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Viola, Richard H.
W.B. Saunders Company, 1977
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Pigors, Paul, author
McGraw-Hill, 1981
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Harris, O. Jeff. Jr.
John Wiley & Sons, 1977
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Thurston, Phillip H., author
Harvard University, 1959
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