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<h2 id="references">References</h2> <ol> <li id="fn:1"><p>"Over puzzels". www.ruiterpuzzel.nl. Retrieved 2018-06-01. <a href="http://www.ruiterpuzzel.nl/RPPagina/geschiedenis_kruiswoordpuzzel.htm#Eerst_gepubliceerde_kruiswoordpuzzel" target="_blank">http://www.ruiterpuzzel.nl/RPPagina/geschiedenis_kruiswoordpuzzel.htm#Eerst_gepubliceerde_kruiswoordpuzzel</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Smith, David (May 15, 2005). "So you thought Sudoku came from the Land of the Rising Sun ..." The Observer. Retrieved June 13, 2008. The puzzle gripping the nation actually began at a small New York magazine <a href="https://www.theguardian.com/media/2005/may/15/pressandpublishing.usnews" target="_blank">https://www.theguardian.com/media/2005/may/15/pressandpublishing.usnews</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> </ol>