Cita APA (7a ed.)

DiJulius, J. R. (2003). Secret service: Hidden systems that deliver unforgettable customer service. AMACOM.

Cita Chicago Style (17a ed.)

DiJulius, John R. Secret Service: Hidden Systems That Deliver Unforgettable Customer Service. New York: AMACOM, 2003.

Cita MLA (8a ed.)

DiJulius, John R. Secret Service: Hidden Systems That Deliver Unforgettable Customer Service. AMACOM, 2003.