Cita APA (7a ed.)

Cannie, J. K., & Caplin, D. (1991). Keeping customers for life. AMACOM.

Cita Chicago Style (17a ed.)

Cannie, Joan Koob, y Donald Caplin. Keeping Customers for Life. New York: AMACOM, 1991.

Cita MLA (9a ed.)

Cannie, Joan Koob, y Donald Caplin. Keeping Customers for Life. AMACOM, 1991.