Safitri, Vivi, Izmiarti Izmiarti, and Jabang Nurdin. 2019. “The Perifiton Alga Community in Masang Kecil River Receives Liquid Palm Oil Mill Waste in Kinali District, West Pasaman Regency”. Jurnal Biologi UNAND 7 (2):100-108. https://doi.org/10.25077/jbioua.7.2.100-108.2019.