Graven, Olaf Hallan, Hallstein Asheim Hansen, and Lachlan MacKinnon. 2009. “A Computer Game Modelling Routing in Computer Networks As Abstract Learning Material in a Blended Learning Environment”. International Journal of Emerging Technologies in Learning (iJET) 4 (7):pp. 18-22. https://doi.org/10.3991/ijet.v4i7.1081.