1.

図書
図書
1. Drucker on leadership : new lessons from the father of modern management. 1st ed (: hardback)
William A. Cohen ; foreword by Frances Hesselbein
出版情報: San Francisco : Jossey-Bass, c2010
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2.

図書
図書
2. A class with Drucker : the lost lessons of the world's greatest management teacher (: pbk)
by William A. Cohen
出版情報: New York : Tokyo : Amacom, c2008
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