Widiastuti, Wiwi, Ulfiyah Rajamudin, and Isrun Isrun. 2016. “Studi Kualitas Tanah Pada Toposequen Sub Das Poboya, Kota Palu”. AGROTEKBIS : JURNAL ILMU PERTANIAN (e-Journal) 4 (5), 544-52. http://103.245.72.23/index.php/agrotekbis/article/view/57.