Cita APA

Sinnott-Armstrong, W., & Fogelin, R. J. (2015). Understanding arguments: An introduction to informal logic (Ninth edition.). Cengage Learning.

Citación estilo Chicago

Sinnott-Armstrong, Walter, and Robert J. Fogelin. Understanding Arguments: An Introduction to Informal Logic. Ninth edition. Stamford, CT: Cengage Learning, 2015.

Cita MLA

Sinnott-Armstrong, Walter, and Robert J. Fogelin. Understanding Arguments: An Introduction to Informal Logic. Ninth edition. Cengage Learning, 2015.