G. Duggan, und S. Payne. CHI '08: Proceeding of the twenty-sixth annual SIGCHI conference on Human factors in computing systems, Seite 39--48. New York, NY, USA, ACM, (2008)
S. Dumais, und W. Jones. CHI '85: Proceedings of the SIGCHI conference on Human factors in computing systems, Seite 127--130. New York, NY, USA, ACM, (1985)
B. Evans, und S. Card. CHI '08: Proceeding of the twenty-sixth annual SIGCHI conference on Human factors in computing systems, Seite 989--998. New York, NY, USA, ACM, (2008)