Copi, I. M. (1997). Symbolic logic (5th ed.). Prentice Hall of India.
Chicago Style aipamenaCopi, Irving M. Symbolic Logic. 5th ed. New Delhi: Prentice Hall of India, 1997.
MLA aipamenaCopi, Irving M. Symbolic Logic. 5th ed. Prentice Hall of India, 1997.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.