Cita APA (7a ed.)

Ries , A. &. (1990). Bottom-up marketing. Penguin.

Cita Chicago Style (17a ed.)

Ries , Al &Trout. Bottom-up Marketing. New York: Penguin, 1990.

Cita MLA (9a ed.)

Ries , Al &Trout. Bottom-up Marketing. Penguin, 1990.