ゼブラ・パズル
↑ Stangroom, Jeremy (2009). Einstein's Riddle: Riddles, Paradoxes, and Conundrums to Stretch Your Mind. Bloomsbury USA. pp. 10–11. ISBN 978-1-59691-665-4. https://archive.org/details/einsteinsriddler0000stan/page/10
↑ M.R.C. van Dongen. “How to Solve the Zebra Problem” (PDF). 2013年11月6日閲覧。
↑ “Capturing Constraint Programming Experience: A Case-Based Approach” (PDF). Cork Constraint Computation Centre, University College, Cork, Ireland.