Vernon,Philip E. (1979). Intelligence: Heredity and environment. W H Freeman and Company.
शिकागो स्टाइल उद्धरणVernon,Philip E. Intelligence: Heredity and Environment. San Francisco: W H Freeman and Company, 1979.
एमएलए उद्धरणVernon,Philip E. Intelligence: Heredity and Environment. W H Freeman and Company, 1979.
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