Auer, Michael E ICL 2011 [elektronický zdroj] : 14th International Conference on Interactive Collaborative Learning and 11th International Conference Virtual University. Piešťany, Slovakia, September 21-23,.2011. -- Piscataway : IEEE, 2011. -- 583 s. -- CD ROM. -- ISBN : 978-1-4577-1746-8. Huba, Mikuláš