Olensia, Yeva, and Renny Kurnia Sari. “POTRET CAMBRIDGE ADVANCED (CHEMISTRY AS AND A LEVEL) DI SEKOLAH MUTIARA HARAPAN RIAU TAHUN AJARAN 2015 2016”. Orbital: Jurnal Pendidikan Kimia, vol. 1, no. 1, June 2017, pp. 12-21, https://doi.org/10.19109/ojpk.v1i1.1861.