Cita APA (7a ed.)

Fogelin, R. J., & Sinnott-Armstrong, W. (1997). Understanding arguments: An introduction to informal logic (5th ed.). Harcourt Brace College.

Cita Chicago Style (17a ed.)

Fogelin, Robert J., y Walter Sinnott-Armstrong. Understanding Arguments: An Introduction to Informal Logic. 5th ed. Fort Worth [etc.]: Harcourt Brace College, 1997.

Cita MLA (9a ed.)

Fogelin, Robert J., y Walter Sinnott-Armstrong. Understanding Arguments: An Introduction to Informal Logic. 5th ed. Harcourt Brace College, 1997.