Susilo, Budi Hartanto, and Petrus Teguh Esha. “Mengamati Keselamatan Penumpang Angkutan Sungai Dan Danau”. Jurnal Teknik Sipil 10, no. 1 (March 28, 2019): 74–90. Accessed June 14, 2025. http://114.7.153.31/index.php/jts/article/view/1384.