Copi,Irving M Cohen, & Carl & Rodych,Victor. (2020). Introduction to logic (15.). Routledge.
Lua i Stíl Chicago (17ú heag.)Copi,Irving M Cohen, agus Carl & Rodych,Victor. Introduction to Logic. 15. New York: Routledge, 2020.
Lua MLA (9ú heag.)Copi,Irving M Cohen, agus Carl & Rodych,Victor. Introduction to Logic. 15. Routledge, 2020.
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