Penrose, J. M. (2004). Business Communication for Managers (5th.). Cengage Learning.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPenrose, John M. Business Communication for Managers. 5th. New Delhi: Cengage Learning, 2004.
एमएलए (9वां संस्करण) प्रशस्ति पत्रPenrose, John M. Business Communication for Managers. 5th. Cengage Learning, 2004.
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