Suleiman Obeidat and  Adnan Bashir and  Wisam Abu Jadayil,  The Importance of Class Attendance and Cumulative GPA for Academic Success in Industrial Engineering Classes.   journal   = {International Journal of Humanities and Social Sciences}, [online]. World Academy of Science, Engineering and Technology.
    January 2012, vol. 61(1). 120 - 123
    [viewed 11 August 2020]. Available from: https://publications.waset.org/pdf/2974.