K. Sousa, H. Mendonça, und J. Vanderdonckt. Task Models and Diagrams for User Interface Design, Volume 5963 von Lecture Notes in Computer Science, Springer Berlin Heidelberg, (2010)
A. Pintus, F. Paternò, und C. Santoro. WEBIST 2010, Proceedings of the 6th International Conference on Web Information Systems and Technologies, Volume 2, Seite 175--180. (2010)