Earl, B. (2004). The practical social research (1st edition.). Thompson.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रEarl, Babbie. The Practical Social Research. 1st edition. New Delhi: Thompson, 2004.
एमएलए (9वां संस्करण) प्रशस्ति पत्रEarl, Babbie. The Practical Social Research. 1st edition. Thompson, 2004.
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