Johns, T. (1994). Perfect customer care: All you need to get it right first time. Arrow, Random House.
Citazione stile Chigago Style (17a edizione)Johns, Ted. Perfect Customer Care: All You Need to Get It Right First Time. London : UK: Arrow, Random House, 1994.
Citatione MLA (8a ed.)Johns, Ted. Perfect Customer Care: All You Need to Get It Right First Time. Arrow, Random House, 1994.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.