sari, novieta, Sidauruk, S. ., Meiliawati, R. ., & Sari, A. R. P. (2020). The Difficulties of X Grade High School Students in Palangka Raya City Academic Year of 2018/2019 in Understanding Chemical Bond Concept using Two-Tier Multiple Choice . GAMAPROIONUKLEUS, 1(2), 135–148. https://doi.org/10.37304/jpmipa.v1i2.3686