WASET
    John Tarus and  Zhendong Niu and  Bakhti Khadidja,  E-Learning Recommender System Based on Collaborative Filtering and Ontology.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2017, vol. 122(2). 256 - 261
    [viewed 11 May 2024]. Available from: https://publications.waset.org/pdf/10006531.