Johnson, G. B. (2009). Essentials of the living world. 3rd ed: McGraw-Hill Education.
शिकागो स्टाइल उद्धरणJohnson, George B. Essentials of the Living World. 3rd ed: McGraw-Hill Education, 2009.
एमएलए उद्धरणJohnson, George B. Essentials of the Living World. 3rd ed: McGraw-Hill Education, 2009.
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