Optner, S. L. (1965). Systems analysis for business and industrial problem solving. Prentice hall.
शिकागो स्टाइल उद्धरणOptner, Stanford L. Systems Analysis for Business and Industrial Problem Solving. New Jersey: Prentice hall, 1965.
एमएलए उद्धरणOptner, Stanford L. Systems Analysis for Business and Industrial Problem Solving. Prentice hall, 1965.
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