COPI, I. M. (1969). Introduction to logic.-- 3rd ed. The Macmillan Company.
Chicago-čujuhus (17. p.)COPI, Irving M. Introduction to Logic.-- 3rd Ed. London: The Macmillan Company, 1969.
MLA-čujuhus (9. p.)COPI, Irving M. Introduction to Logic.-- 3rd Ed. The Macmillan Company, 1969.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.