WASET
    Ahmed A. Hassan and  Hassan I. Ali and  Abdallah A. Salum and  Asia M. Kassim and  Yussuf N. Elmoge and  Ali A. Amour,  Factors Affecting Students’ Performance in Chemistry: Case Study in Zanzibar Secondary Schools.   journal   = {International Journal of Educational and Pedagogical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    January 2015, vol. 107(11). 4086 - 4093
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/10006159.