Lua APA (7ú heag.)

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

Lua i Stíl Chicago (17ú heag.)

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

Lua MLA (9ú heag.)

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

Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.