Cita APA

Beckwith, H. (1997). Selling the invisible: A field guide to modern marketing. New York: Warner.

Chicago Style Citation

Beckwith, Harry. Selling the Invisible: A Field Guide to Modern Marketing. New York: Warner, 1997.

Cita MLA

Beckwith, Harry. Selling the Invisible: A Field Guide to Modern Marketing. New York: Warner, 1997.

Atenció: Aquestes cites poden no estar 100% correctes.