Mapulanga, T. . “Investigating Factors Influencing Grade 9 and 12 Learner-Performance in Science – Views of School Administrators, Teachers, and Learners: The Case of Eastern Province, Zambia”. World Journal of Vocational Education and Training, vol. 1, no. 1, May 2019, pp. 20-30, doi:10.18488/journal.119.2019.11.20.30.