Cita APA (7th ed.)

Copi, Irving M, & Jackson, H. (1996). Informal Logic: Possible Worlds and Everyday Inferences (3rd ed.). Prentice Hall.

Cita Chicago (17th ed.)

Copi, Irving M, i Howard Jackson. Informal Logic: Possible Worlds and Everyday Inferences. 3rd ed. Upper Saddle River, NJ: Prentice Hall, 1996.

Cita MLA (9th ed.)

Copi, et al. Informal Logic: Possible Worlds and Everyday Inferences. 3rd ed. Prentice Hall, 1996.