Budiasih, Kun Sri. “Penentuan Efisiensi Immobilisasi Kromium (VI) Pada Geopolimer Abu Sekam Padi Dengan Uji TCLP (Toxicity Characteristic Leaching Procedure)”. EKSAKTA: Journal of Sciences and Data Analysis 12, no. 1 (February 15, 2012). Accessed April 27, 2024. https://journal.uii.ac.id/Eksakta/article/view/2437.