APA

Cohen William A,, . (2007). A class with Drucker : The lost lessons of the world's greatest management teacher. New York: American Management Association.

Chicago

Cohen William A,, . 2007. A class with Drucker : The lost lessons of the world's greatest management teacher. New York: American Management Association.

Harvard

Cohen William A,, . (2007). A class with Drucker : The lost lessons of the world's greatest management teacher. New York: American Management Association.

MLA

Cohen William A,, . A class with Drucker : The lost lessons of the world's greatest management teacher. New York: American Management Association. 2007.