Zelko, H. P. (1957). Successful Conference and Discussion Techniques. New York: McGraw-Hill Book Co..
शिकागो स्टाइल उद्धरणZelko, Harold P. Successful Conference and Discussion Techniques. New York: McGraw-Hill Book Co., 1957.
एमएलए उद्धरणZelko, Harold P. Successful Conference and Discussion Techniques. New York: McGraw-Hill Book Co., 1957.
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