Παραπομπή σε μορφή APA (7η εκδ.)

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

Παραπομπή σε μορφή Chicago (17η εκδ.)

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

Παραπομπή σε μορφή MLA (9th εκδ.)

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