Doctor, R. Principles and practice of business communication.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDoctor, Rhoda. Principles and Practice of Business Communication.
एमएलए (9वां संस्करण) प्रशस्ति पत्रDoctor, Rhoda. Principles and Practice of Business Communication.
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