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1
Essentials of management / Harold Koontz, Dyril O'Donnell, Heinz Weihrich
New York : McGraw-Hill, c1986
xxiii, 564 p. : ill. ; 24 cm.
2
Management / Harold Koontz, Heinz Weihrich.
New York : McGraw-Hill, c1988
xxix, 685 p. : ill. (some col.) ; 25 cm.