A class with Drucker : the lost lessons of the world's greatest management teacher
Cohen, William A., 1937-
[United States] : Gildan Audio, 2008.

A class with Drucker : the lost lessons of the world's greatest management teacher
Cohen, William A., 1937-
New York : AMACOM/ American Management Association, ©2008.

Drucker on leadership : new lessons from the father of modern management
Cohen, William A., 1937-
San Francisco : Jossey-Bass, ©2010.

Drucker on marketing : lessons from the world's most influential business thinker
Cohen, William A., 1937-
New York : McGraw-Hill, ©2013.

The entrepreneur and small business problem solver
Cohen, William A., 1937-
New York : Wiley, 2006.

Peter Drucker on consulting : how to apply Drucker's principles for business success
Cohen, William A., 1937-
New York : LID Publishing Inc. ; [2016]

Peter Drucker's way to the top : lessons for reaching your life's goals
Cohen, William A., 1937- author.
London : LID, [2019]

The practical Drucker : applying the wisdom of the world's greatest management thinker
Cohen, William A., 1937- author.
[United States] : Gildan Media, 2013.

The practical Drucker : applying the wisdom of the world's greatest management thinker
Cohen, William A., 1937- author.
New York : AMACOM, American Management Association, [2014]