Singh,O P. (2012). Art of Effective Communication in Group Discussion and Interview. S Chand.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSingh,O P. Art of Effective Communication in Group Discussion and Interview. New Delhi: S Chand, 2012.
एमएलए (9वां संस्करण) प्रशस्ति पत्रSingh,O P. Art of Effective Communication in Group Discussion and Interview. S Chand, 2012.
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