Παραπομπή APA

Gupta, V. (2003). Call center: Training course kit. Dreamtech press.

Παραπομπή Chicago Style

Gupta, Vikas. Call Center: Training Course Kit. New Delhi: Dreamtech press, 2003.

Παραπομπή MLA

Gupta, Vikas. Call Center: Training Course Kit. Dreamtech press, 2003.