Hurley, P. J. (1982). A. Concise introduction to logic. Wadsworth Publishing.
Lua i Stíl Chicago (17ú heag.)Hurley, Patrick J. A. Concise Introduction to Logic. Wadsworth Publishing, 1982.
Lua MLA (8ú heag.)Hurley, Patrick J. A. Concise Introduction to Logic. Wadsworth Publishing, 1982.
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