Melvin Ballera and Mosbah Mohamed Elssaedi and Ahmed Khalil Zohdy, Collaborative E-Learning with Multiple Imaginary Co-Learner: Design, Issues and Implementation. journal = {International Journal of Educational and Pedagogical Sciences}, [online]. World Academy of Science, Engineering and Technology. January 2013, vol. 73(1). 72 - 76 [viewed 20 September 2024]. Available from: https://publications.waset.org/pdf/8059.