Cita APA (7th ed.)
DiJulius, J. R. (2003). Secret service: Hidden systems that deliver unforgettable customer service. AMACOM.
Cita Chicago (17th ed.)
DiJulius, John R. Secret Service: Hidden Systems That Deliver Unforgettable Customer Service. New York: AMACOM, 2003.
Cita MLA (9th ed.)
DiJulius, John R. Secret Service: Hidden Systems That Deliver Unforgettable Customer Service. AMACOM, 2003.
Atenció: Aquestes cites poden no estar 100% correctes.