C. Watson, F. Li, и J. Godwin. Proceedings of the 11th International Conference on Advances in Web-Based Learning, стр. 228--239. Berlin, Heidelberg, Springer-Verlag, (2012)
C. Watson, F. Li, и J. Godwin. Proceedings of the 11th International Conference on Advances in Web-Based Learning, стр. 228--239. Berlin, Heidelberg, Springer-Verlag, (2012)