Cha, S.E., Jun, S.J., Kwon, D.Y., Kim, H.S., Kim, S.B., Kim, J.M., Kim, Y.A., Han, S.G., Seo, S.S., Jun, W.C., Kim, H.C. & Lee, W.G. (2011). Measuring achievement of ICT competency for students in Korea. Computers & Education. 56 (4), pp. 990-1002. Elsevier Ltd.