Gaya APA

COHEN, W, A. (2013). WILLIAM DRUCKER ON MARKETING LESSON FROM THE WORLD'S MOST INFLUENTIAL BUSINESS THINKER . New York: MC GRAW HILL.

Gaya MLA

COHEN, WILLIAM, A. "WILLIAM DRUCKER ON MARKETING LESSON FROM THE WORLD'S MOST INFLUENTIAL BUSINESS THINKER". New York: MC GRAW HILL, 2013. Text.