APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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

Let op: Deze citaties zijn niet altijd 100% accuraat.