Beins, B. C. (2019). Research Methods (4th.). Cambridge University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBeins, Bernard C. Research Methods. 4th. Cambridge: Cambridge University Press, 2019.
एमएलए (9वां संस्करण) प्रशस्ति पत्रBeins, Bernard C. Research Methods. 4th. Cambridge University Press, 2019.
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