Copi, I. M. c. (2020). Introduction to Logic (15th.). Routledge.
Chicago-čujuhus (17. p.)Copi, Irring M; cohen. Introduction to Logic. 15th. New York: Routledge, 2020.
MLA-čujuhus (9. p.)Copi, Irring M; cohen. Introduction to Logic. 15th. Routledge, 2020.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.