Okta Pirera. “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, vol. 2, no. 2, Nov. 2021, pp. 111-20, doi:10.37304/jpmipa.v2i2.5049.