Kelley, D. (2013). Art of Reasoning: Introduction to Logic (4th.). Norton.
Chicago-čujuhus (17. p.)Kelley, David. Art of Reasoning: Introduction to Logic. 4th. New york: Norton, 2013.
MLA-čujuhus (9. p.)Kelley, David. Art of Reasoning: Introduction to Logic. 4th. Norton, 2013.
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