<hi xmlns="http://www.tei-c.org/ns/1.0" rend="bold">Krug, Steve</hi>. 2009. <hi xmlns="http://www.tei-c.org/ns/1.0" rend="italic">Rocket Surgery Made Easy: The Do-it-Yourself Guide to Finding and Fixing Usability Problems</hi>. Illustrated Edition. Berkeley, Calif: New Riders, Dezember. ISBN: 978-0-321-65729-9.