Perdana, Ryzal, and Ratu Beta Rudibyani. 2018. “Enhancing Students’ Cognitive Outcome in Chemistry by Guided Inquiry Learning Models”. International Journal of Sciences: Basic and Applied Research (IJSBAR) 37 (3):44-51. https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/8723.