Berlanga, A. J., Sloep, P. B., Brouns, F., Bitter-Rijpkema, M. E., & Koper, R. (2008). Towards a TENCompetence ePortfolio. International Journal of Emerging Technologies in Learning (iJET), 3, pp. 24–28. https://doi.org/10.3991/ijet.v3i0.552