Sharp, D. E. (2003). Call Center Operation: Design, operation, and maintenance. Amsterdam: Digital Press.
استشهاد بنمط شيكاغوSharp, Duane E. Call Center Operation: Design, Operation, and Maintenance. Amsterdam: Digital Press, 2003.
MLA استشهادSharp, Duane E. Call Center Operation: Design, Operation, and Maintenance. Amsterdam: Digital Press, 2003.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.