1. [1] H.E. Dudeney, The Canterbury Puzzles, Dover Publications, 1958.
2. [2] J. Slocum, The Tangram Book: The Story of the Chinese Puzzle with Over 2000 Puzzle to Solve, Sterling Publishing, 2004.
3. [3] M. Gardner, Time Travel and Other Mathematical Bewilderments, W.H. Freeman and Company, 1987.
4. [4] T. Takeda, http://www.matsusaki.jp/local-event/20140310/1024/, (in Japanese; accessed 8 May 2014), March 2014.
5. [5] F.T. Wang and C.-C. Hsiung, “A theorem on the tangram,” The American Mathematical Monthly, vol.49, no.9, pp.596-599, 1942.