Cohen, W. A. (1985). How to make it big as a consultant. Amacom.
Tohutoru Kātū Chicago (17th ed.)Cohen, William A. How to Make It Big as a Consultant. New York: Amacom, 1985.
Tohutoro MLA (9th ed.)Cohen, William A. How to Make It Big as a Consultant. Amacom, 1985.
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