GeekoSystem . http://www.geekosystem.com/joe-stack-facebook-groups-joseph-andrew-stack/ . Retrieved February 23, 2010 . ^ Yager, Jordy (February 19, 2010). "Muslim group wants government to call plane attack terrorism" . The Hill . http://thehill.com/business-a-lobbying/82387-muslim-group-wants-government-to-call-austin-plane-attack-terrorism . Retrieved February 20, 2010 . ^ Madigan, Tim (February 20, 2010). "Experts call Austin plane crash a 'cathartic outburst,' not terrorism" .