http://ths.tomahawk.libguides.com/c.php?g=318276&p=2751554
http://libguides.spokanefalls.edu/c.php?g=288749&p=3323494
http://depts.washington.edu/trio/quest/citation/apa_mla_citation_game/index.htm
https://www.lib.jmu.edu/tictactoe/