Gupta, V. (2003). Call center: Training course kit. Dreamtech press.
Chicago Edition CitationGupta, Vikas. Call Center: Training Course Kit. New Delhi: Dreamtech press, 2003.
Cita MLAGupta, Vikas. Call Center: Training Course Kit. Dreamtech press, 2003.
Atenció: Aquestes cites poden no estar 100% correctes.