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Knowledge has to be improved, challenged, and increased constantly, or it vanishes.
Peter Ferdinand Drucker (November 19, 1909 - November 11, 2005) was a writer, management consultant, and self-described "social ecologist"
All Peter Drucker quotes | Peter Drucker Books
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"Peter Drucker Quotes." Quotes.net. STANDS4 LLC, 2016. Web. 3 May 2016. <http://www.quotes.net/quote/50215>.
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