• Peter F. Drucker Knowledge has to be improved, challenged, and increased constantly, or it vanishes.
    Peter F. Drucker
    American management consultant and writer 1909-2005
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Peter F. Drucker - Knowledge has to be improved, challenged, and increased constantly, or it vanishes.
Knowledge has to be improved, challenged, and increased constantly, or it vanishes. by : Peter F. Drucker

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river-forest Knowledge has to be improved, challenged, and increased constantly, or it vanishes.
- Peter F. Drucker Greatest-Quotations.com