APA-viite (7. p.)

Villanueva, R., & Escresa, A. L. (2012). Call center minimum standard guide. DZUP.

Chicago-viite (17. p.)

Villanueva, Raymund, ja Anna Leah Escresa. Call Center Minimum Standard Guide. Quezon City: DZUP, 2012.

MLA-viite (9. p.)

Villanueva, Raymund, ja Anna Leah Escresa. Call Center Minimum Standard Guide. DZUP, 2012.