Copi, I. M., Cohen, C., & Rodych, V. (2019). Introduction To Logic (15th.). Routledge.
Chicago-čujuhus (17. p.)Copi, Irving M., Carl Cohen, juo Victor Rodych. Introduction To Logic. 15th. New York: Routledge, 2019.
MLA-čujuhus (9. p.)Copi, Irving M., et al. Introduction To Logic. 15th. Routledge, 2019.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.