Wratten, S. D. (1980). Field and laboratory exercises in ecology. London: Arnold.
शिकागो स्टाइल उद्धरणWratten, Stephen D. Field and Laboratory Exercises in Ecology. London: Arnold, 1980.
एमएलए उद्धरणWratten, Stephen D. Field and Laboratory Exercises in Ecology. London: Arnold, 1980.
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