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2
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Management : tasks, responsibilities, practices / Peter F. Drucker.
- 658.4 D7941m
- Drucker, Peter F. 1909-2005.
- Harper & Row,
- c1974.
- New York :
-
The effective executive / Peter F. Drucker.
- 658.4
- Drucker, Peter F. 1909-2005
- Harper & Row,
- 1985, c1967.
- New York :