Nurlela, Nurlela, and Finda Pratiwi Istomo. 2020. “KARAKTERISASI DAN PROPORSI ABU TERBANG (FLY ASH) DALAM PEMBUATAN PCC (PORTLAND COMPOSITE CEMENT)”. Sains Natural: Journal of Biology and Chemistry 10 (2):71-86. https://doi.org/10.31938/jsn.v10i2.284.