References
- B. Averbach and O. Chein, Problem Solving through Recreational Mathematics, Dover Publications, Mineola NY, 2000.
- A. T. Benjamin and J. J. Quinn, Proofs that Really Count, Mathematical Association of America, Washington DC, 2003.
- P. Hilton and J. Pedersen, Looking into Pascal's triangle: Combinatorics, arithmetic, and geometry, Math. Mag. 60 (1987) 305–316; available at http://dx.doi.org/10.2307/2690414.
- R. Smullyan, The Lady or the Tiger?: and Other Logic Puzzles, Dover Publications, Mineola NY, 2009.
- R. Smullyan, What Is the Name of This Book?: The Riddle of Dracula and Other Puzzles, Dover Publications, Mineola NY, 2011.