Drucker, Peter F. (Peter Ferdinand), 1909-2005, author
Pan Books, 1982
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Seelye, Elwyn E.
New York: John Wiley & Sons, 1954
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Drucker, Peter F. (Peter Ferdinand), 1909-2005, author
Harper & Row, 1945
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Drucher, Peter F
New York: H. Harper & Row, 1954
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Redman
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