Hernán G. Cortés-Mora and  José I. Péna-Reyes and  Alfonso Herrera-Jiménez,  Education for Sustainability Using PBL on an Engineering Course at the National University of Colombia.   journal   = {International Journal of Educational and Pedagogical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    November 2017, vol. 132(12). 2799 - 2806
    [viewed 21 October 2019]. Available from: https://publications.waset.org/pdf/10008371.