Sungkawa, Iwa. “Penerapan Rasio Sampling Dalam Pendugaan Rasio Lahan Kritis Di Wilayah Das Jratun”. ComTech: Computer, Mathematics and Engineering Applications 3, no. 1 (June 1, 2012): 170–176. Accessed July 7, 2025. https://journal.binus.ac.id/index.php/comtech/article/view/2419.