Παραπομπή APA

Denton, D. K. (1990). How to give quality service to your customers. Universal.

Παραπομπή Chicago Style

Denton, D. Keith. How to Give Quality Service to Your Customers. New Delhi: Universal, 1990.

Παραπομπή MLA

Denton, D. Keith. How to Give Quality Service to Your Customers. Universal, 1990.