1. The Hitchhiker's guide to the galaxy, 25th anniversary;Adams,2004
2. Many-valued logics;Bolc,1992
3. Boole, G. (1854/1951). An investigation of the laws of thought, on which are founded the mathematical theories of logic and probabilities. New York: Macmillan and Co./New York: Dover Books. [The original is a rare collector's piece, but you can get a reprint of the original 1854 edition (Dover Books, 1951).]
4. Celko, J. (1992). SQL explorer: Voting systems. DBMS Magazine, 11.
5. Wheels, life, and other mathematical amusements;Gardner,1983