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Raymond M. Smullyan. What Is the Name of This Book? Penguin; 1981.
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Smullyan RM. First-Order Logic. Vol Band 43. Springer-Verlag; 1968. https://ebookcentral.proquest.com/lib/UCL/detail.action?docID=3098371&pq-origsite=primo
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Jeffrey RC. Formal Logic: Its Scope and Limits. McGraw-Hill; 1967.
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Keisler HJ, Robbin JW. Mathematical Logic and Computability. The McGraw-Hill Companies, Inc; 1996.
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Ainsley Robert. Bluff Your Way in Computers. Oval Books; 1999. http://copac.jisc.ac.uk/id/19561755?style=html&title=Bluff%20your%20way%20in%20computers
