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