Ellah, Barnabas O., Emmanuel E. Achor, and Veronica Enemarie. “Problem-Solving Skills As Correlates of Attention Span and Working Memory of Low Ability Level Students in Senior Secondary Schools”. Journal of Education and e-Learning Research 6, no. 3 (August 28, 2019): 135-141. Accessed October 23, 2019. http://asianonlinejournals.com/index.php/JEELR/article/view/955.