Copi, I. M. (2019). Introduction to Logic (15th.). Routledge.
Chicago-čujuhus (17. p.)Copi, Irving M. Introduction to Logic. 15th. Routledge, 2019.
MLA-čujuhus (9. p.)Copi, Irving M. Introduction to Logic. 15th. Routledge, 2019.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.