Gaya APA

III, J, R, D. (2003). Secret Service : HIdden Systems That Deliver Unforgettable Customer Service . United States of America: AMACOM.

Gaya MLA

III, John, R., Dijulius. "Secret Service : HIdden Systems That Deliver Unforgettable Customer Service". United States of America: AMACOM, 2003. Text.