Sawyer, W. W. (1959). Concrete approach to abstract algebra. Freeman.
शिकागो स्टाइल उद्धरणSawyer, W W. Concrete Approach to Abstract Algebra. London: Freeman, 1959.
एमएलए उद्धरणSawyer, W W. Concrete Approach to Abstract Algebra. Freeman, 1959.
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