APA ציטוט

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

Trích dẫn kiểu Chicago

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

ציטוט MLA

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