Sungkawa, I. 2012. Penerapan Rasio Sampling Dalam Pendugaan Rasio Lahan Kritis di Wilayah Das Jratun. ComTech: Computer, Mathematics and Engineering Applications. 3, 1 (Jun. 2012), 170-176. DOI:https://doi.org/10.21512/comtech.v3i1.2419.