Cita APA (7th ed.)

PEPPERS DON. (2005). RETURN ON CUSTOMER. DOUBLEDAY.

Cita Chicago (17th ed.)

PEPPERS DON. RETURN ON CUSTOMER. NEW YORK: DOUBLEDAY, 2005.

Cita MLA (9th ed.)

PEPPERS DON. RETURN ON CUSTOMER. DOUBLEDAY, 2005.