Ngapa, Yulius, AND 		Gago, Jumilah.
" ADSORPSI ION Pb(II) OLEH ZEOLIT ALAM ENDE  TERAKTIVASI ASAM: STUDI PENGEMBANGAN  MINERAL ALTERNATIF PENJERAP     LIMBAH LOGAM BERAT" <em>CAKRA KIMIA (Indonesian E-Journal of Applied Chemistry)</em> [Online], Volume 7 Number 2 (31 October 2019)