1. Baumgarten, A. (1983). Kollegium über die Ästhetik, Section 1. In HR Schweizer (Ed.), Texte zur Grundlegung der Ästhetik. 78–83. Hamburg: Felix Meiner.
2. Britannica (2003). Encyclopedia Britannica: With 2004 Book of the Year (Britannica Books).Encyclopedia Britannica Corporation.
3. Calhoun, T. (2005). Bravo for the Duke iPod Experiment. Campus Technology, 21.06.2005 Available online:
http://campustechnology.com/articles/2005/06/bravo-for-the-duke-ipod-experiment_633573772543619027.aspx
.
4. Carroll, J. M. (1990). The Nurnberg Funnel: Designing Minimalist Instruction for Practical Computer Skill (Technical Communication, Multimedia, and Information Systems). Cambridge, MA: The MIT Press.
5. Carroll, J. M. (1992). Making errors, making sense, making use. In C Floyd (Ed.), Software Development and Reality Construction. 155–167. Berlin Heidelberg, :New York: Springer.