Villanueva, R., & Escresa, A. L. (2012). Call center minimum standard guide. DZUP.
芝加哥风格引文Villanueva, Raymund, 与 Anna Leah Escresa. Call Center Minimum Standard Guide. Quezon City: DZUP, 2012.
MLA引文Villanueva, Raymund, 与 Anna Leah Escresa. Call Center Minimum Standard Guide. DZUP, 2012.
警告：这些引文格式不一定是100％准确.