Barnet Sylvan, & Bedau Hugo. (2008). Current Issues and Enduring Questions: A Guide to Critical Thinking and Argument, with Readings (Tái bản lần thứ 8.). U.S.A: MC Graw Hill.
शिकागो स्टाइल उद्धरणBarnet Sylvan, और Bedau Hugo. Current Issues and Enduring Questions: A Guide to Critical Thinking and Argument, With Readings. Tái bản lần thứ 8. U.S.A: MC Graw Hill, 2008.
एमएलए उद्धरणBarnet Sylvan, और Bedau Hugo. Current Issues and Enduring Questions: A Guide to Critical Thinking and Argument, With Readings. Tái bản lần thứ 8. U.S.A: MC Graw Hill, 2008.
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