Ries, A. (1990). Bottom up marketing. Penguin (Plume).
Cita Chicago Style (17a ed.)Ries, Al. Bottom Up Marketing. New York: Penguin (Plume), 1990.
Cita MLA (9a ed.)Ries, Al. Bottom Up Marketing. Penguin (Plume), 1990.
Precaución: Estas citas no son 100% exactas.