Kumar, H. D. (1997). Modern concepts of ecology (8th rev. ed.). Vikas Pub. House ; UBS Publishers' Distributors.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKumar, H. D. Modern Concepts of Ecology. 8th rev. ed. New Delhi: Vikas Pub. House ; UBS Publishers' Distributors, 1997.
एमएलए (8वां संस्करण) प्रशस्ति पत्रKumar, H. D. Modern Concepts of Ecology. 8th rev. ed. Vikas Pub. House ; UBS Publishers' Distributors, 1997.
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