Henri P Keller. (1982). Evaluation program physics: Principles and problems (Reproducible Masters). Columbus, Ohio: Charles E. Merrill.
शिकागो स्टाइल उद्धरणHenri P Keller. Evaluation Program Physics: Principles and Problems (Reproducible Masters). Columbus, Ohio: Charles E. Merrill, 1982.
एमएलए उद्धरणHenri P Keller. Evaluation Program Physics: Principles and Problems (Reproducible Masters). Columbus, Ohio: Charles E. Merrill, 1982.
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