Johnson, D. M. (1961). Psychology: A problems solving approach. Harper & Brothers.
शिकागो स्टाइल उद्धरणJohnson, Donald M. Psychology: A Problems Solving Approach. New York: Harper & Brothers, 1961.
एमएलए उद्धरणJohnson, Donald M. Psychology: A Problems Solving Approach. Harper & Brothers, 1961.
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