Aloysius Duran Corebima, Henny Setiawati. 2017. “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 4 (5):3521-26. https://doi.org/10.18535/ijsshi/v4i5.09.