APA (7 वां संस्करण) प्रशस्ति पत्र
Comfort, J. a. (1994). Speaking effectively: Developing speaking skills for business english. CUP.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Comfort, Jeremy...[et al]. Speaking Effectively: Developing Speaking Skills for Business English. Cambridge: CUP, 1994.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Comfort, Jeremy...[et al]. Speaking Effectively: Developing Speaking Skills for Business English. CUP, 1994.
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