APA (7e ed.) Bronvermelding

Beckwith Harry. (1997). Selling the invisible: A field guide to modern marketing. Warner Books / Time Warner Company.

Chicago (17e ed.) Bronvermelding

Beckwith Harry. Selling the Invisible: A Field Guide to Modern Marketing. NewYork ,USA: Warner Books / Time Warner Company, 1997.

MLA (9e ed.) Bronvermelding

Beckwith Harry. Selling the Invisible: A Field Guide to Modern Marketing. Warner Books / Time Warner Company, 1997.

Let op: Deze citaties zijn niet altijd 100% accuraat.