Gupta, V. (2003). Call center: Training course kit. Dreamtech press.
シカゴスタイル引用形Gupta, Vikas. Call Center: Training Course Kit. New Delhi: Dreamtech press, 2003.
MLA引用形式Gupta, Vikas. Call Center: Training Course Kit. Dreamtech press, 2003.
警告: この引用は必ずしも正確ではありません.