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* [https://www.stmintz.com/ccc/index.php?id=14001 Square-of-the-pawn] by [[Stuart Cracraft]], [[CCC]], January 13, 1998
* [http://www.talkchess.com/forum/viewtopic.php?t=21149 Rule of Square test position] by [[Charles Roberson]], [[CCC]], May 15, 2008
* [https://groups.google.com/d/msg/fishcooking/T7OFWxD4LK8/pzurkRQNLjwJ Rule of the square] by [[Mikael Bäckman|Mikael]], [[Computer Chess Forums|FishCooking]], September 24, 2014 » [[Stockfish]]
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