Pratiwi, N. I., A. Huwaida, S. Indah, and D. Helard. “Adsorption And Regeneration Of Sungai Pasak Pumice As An Adsorbent For Ammonium Removal In Water”. Jurnal Riset Teknologi Pencegahan Pencemaran Industri, vol. 10, no. 1, May 2020, pp. 38-46, doi:10.21771/jrtppi.2019.v10.no1.p38-46.