Sinnott-Armstrong, W., & Fogelin, R. J. (2015). Understanding arguments: An introduction to informal logic (Ninth edition, concise; student edition.). Cengage Learning.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSinnott-Armstrong, Walter, और Robert J. Fogelin. Understanding Arguments: An Introduction to Informal Logic. Ninth edition, concise; student edition. Stamford, CT: Cengage Learning, 2015.
एमएलए (9वां संस्करण) प्रशस्ति पत्रSinnott-Armstrong, Walter, और Robert J. Fogelin. Understanding Arguments: An Introduction to Informal Logic. Ninth edition, concise; student edition. Cengage Learning, 2015.
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