“The Effect of Portfolio-Based Learning Models and Self-Regulated Learning on student™s Creative Thinking Skills on Acid and Base Materials”. Jurnal Pendidikan Kimia 12, no. 2 (August 3, 2020): 88–94. Accessed March 20, 2026. https://jurnal.unimed.ac.id/2012/index.php/jpk/article/view/19406.