Smullyan, R. M. (2017). A beginner's further guide to mathematical logic. World Scientific.
Lua i Stíl Chicago (17ú heag.)Smullyan, Raymond M. A Beginner's Further Guide to Mathematical Logic. New Jersey: World Scientific, 2017.
Lua MLA (9ú heag.)Smullyan, Raymond M. A Beginner's Further Guide to Mathematical Logic. World Scientific, 2017.
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