Kumar,H.D. (2008). General Ecology. Associated Business Corporation.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKumar,H.D. General Ecology. Dhaka,Bangladesh: Associated Business Corporation, 2008.
एमएलए (8वां संस्करण) प्रशस्ति पत्रKumar,H.D. General Ecology. Associated Business Corporation, 2008.
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