<hi xmlns="http://www.tei-c.org/ns/1.0" rend="bold">Tullis, T / Albert, B (2013)</hi>: <hi xmlns="http://www.tei-c.org/ns/1.0" rend="italic">Measuring the User Experience. Collecting, Analyzing, and Presenting Usability Metrics</hi>. Burlington/New York: Morgan Kaufmann/Elsevier.