Y. Olensia and R. Kurnia Sari, “POTRET CAMBRIDGE ADVANCED (CHEMISTRY AS AND A LEVEL) DI SEKOLAH MUTIARA HARAPAN RIAU TAHUN AJARAN 2015/2016”, OJPK, vol. 1, no. 1, pp. 12–21, Jun. 2017, doi: 10.19109/ojpk.v1i1.1861.