<hi xmlns="http://www.tei-c.org/ns/1.0" rend="bild"><hi rend="bold">Nielsen, Jakob</hi></hi> (2012): "Usability 101: Introduction to Usability", in: <hi xmlns="http://www.tei-c.org/ns/1.0" rend="italic">Nielson Norman Group</hi>. Evidence-Based User Experience Research, Training, and Consulting <ref xmlns="http://www.tei-c.org/ns/1.0" target="http://www.nngroup.com/articles/usability-101-introduction-to-usability/">https://www.nngroup.com/articles/usability-101-introduction-to-usability/</ref> [letzter Zugriff 14. Oktober 2015].