Hurley, P. J. (1988). A concise introduction to logic (3rd ed.). Wadsworth.
Lua i Stíl Chicago (17ú heag.)Hurley, Patrick J. A Concise Introduction to Logic. 3rd ed. California: Wadsworth, 1988.
Lua MLA (9ú heag.)Hurley, Patrick J. A Concise Introduction to Logic. 3rd ed. Wadsworth, 1988.
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