Witham, F. H. (1986). Exercises in plant physiology. Boston: Prindle, Weber & Schmidt.
शिकागो स्टाइल उद्धरणWitham, Francis H. Exercises in Plant Physiology. Boston: Prindle, Weber & Schmidt, 1986.
एमएलए उद्धरणWitham, Francis H. Exercises in Plant Physiology. Boston: Prindle, Weber & Schmidt, 1986.
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