Marlina, R., Oktasari, A. and Rohmatullaili, R. (2022) “Utilization of Adsorbent Cocoa Shell For Purification of Used Cooking Oil”, Stannum : Jurnal Sains dan Terapan Kimia, 4(1), pp. 6-12. doi: 10.33019/jstk.v4i1.2638.