Drucker, Peter F. (Peter Ferdinand), 1909-2005, author
Butterworth-Heinemann, 1974
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Griffin, Ricky W., author
Houghton Mifflin, 1987
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Elkin, Arthur
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Robbins, Stephen P., author
Pearson Education International, 2005
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Robbins, Stephen P., author
Prentice-Hall, 2002
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