C. Arizzi, I. Marenzi, и M. Jaén. Proceedings of the International Workshop on Evidence-based Technology Enhanced Learning(EbTEL 12), том 152 из Advances in Intelligent and Soft Computing, стр. 67-74. Springer-Verlag GmbH, (2012)
I. Marenzi, S. Zerr, F. Abel, и W. Nejdl. International Journal of Continuing Engineering Education and Life-Long Learning (IJCEELL), 19 (4/5/6):
276-290(2009)