Hurley, P. J. (2006). Concise Introduction To Logic (9th ed.). Thomson.
Lua i Stíl Chicago (17ú heag.)Hurley, Pattrick J. Concise Introduction To Logic. 9th ed. Australia: Thomson, 2006.
Lua MLA (9ú heag.)Hurley, Pattrick J. Concise Introduction To Logic. 9th ed. Thomson, 2006.
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