Oktavianta, I. D., Gusrizal, G. and Nurlina, N. (2020) “Oil Palm Empty Bunch Compost as a Source of Humic Acid”, Jurnal Akademika Kimia. Palu, Sulawesi Tengah - INDONESIA, 9(4), pp. 205–212. doi: 10.22487/j24775185.2020.v9.i4.pp205-212.