Okta Pirera. 2021. “Profile of Mastery of Hydrocarbon Compound Concepts in Class XI MIPA-2 Students of SMA Negeri 4 Palangka Raya for Academic Year 2018/2019”. GAMAPROIONUKLEUS 2 (2):111-20. https://doi.org/10.37304/jpmipa.v2i2.5049.