Laliyo, Lukman Abdul Rauf, Deasy Natalia Botutihe, and Citra Panigoro. 2019. “The Development of Two-Tier Instrument Based On Distractor to Assess Conceptual Understanding Level and Student Misconceptions in Explaining Redox Reactions”. International Journal of Learning, Teaching and Educational Research 18 (9):216-37. http://www.ijlter.net/index.php/ijlter/article/view/515.