Widdowson, R. W. (1987). Towards holistic agriculture: A scientific approach. New York: Pergamon Press.
शिकागो स्टाइल उद्धरणWiddowson, R. W. Towards Holistic Agriculture: A Scientific Approach. New York: Pergamon Press, 1987.
एमएलए उद्धरणWiddowson, R. W. Towards Holistic Agriculture: A Scientific Approach. New York: Pergamon Press, 1987.
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