Wanko, Jeffrey J. (November 2009). "Japanese logic puzzles and proof". The Mathematics Teacher. 103 (4). National Council of Teachers of Mathematics: 266–271. doi:10.5951/mt.103.4.0266. JSTOR20876604.
jstor.org
Wanko, Jeffrey J. (November 2009). "Japanese logic puzzles and proof". The Mathematics Teacher. 103 (4). National Council of Teachers of Mathematics: 266–271. doi:10.5951/mt.103.4.0266. JSTOR20876604.