Luciano Gualà; Stefano Leucci; Emanuele Natale (24 de março de 2014). «Bejeweled, Candy Crush and other Match-Three Games are (NP-)Hard». Bibcode:2014arXiv1403.5830G. arXiv:1403.5830
casualcharts.com
Juul (2009) p. 100; making reference to data from casualcharts.com for the "match3" and "chainpopper" mechanics as tracked by "popular portals" (footnote 52)
Luciano Gualà; Stefano Leucci; Emanuele Natale (24 de março de 2014). «Bejeweled, Candy Crush and other Match-Three Games are (NP-)Hard». Bibcode:2014arXiv1403.5830G. arXiv:1403.5830