Jorda, E. R., and O. C. De los Santos. “Effect of Computer Game-Based Learning on the Performance in Trigonometry of the ESEP High School Students”. Asia Pacific Higher Education Research Journal (APHERJ), vol. 2, no. 2, Nov. 2015, https://po.pnuresearchportal.org/ejournal/index.php/apherj/article/view/112.