Aloysius Duran Corebima, H. S. “Empowering Critical Thinking Skills Of The Students Having Different Academic Ability in Biology Learning of Senior High School through PQ4R - TPS Strategy”. International Journal of Social Sciences and Humanities Invention, vol. 4, no. 5, May 2017, pp. 3521-6, doi:10.18535/ijsshi/v4i5.09.