Wahyuningsih, Sri, Nadjadji Anwar, Edijatno, and Nieke Karnaningroem. “A Comparative Study of Water Quality Characteristics at East Java River”. IPTEK The Journal for Technology and Science 21, no. 4 (July 1, 2025): 196–192. Accessed January 30, 2026. https://journal.its.ac.id/index.php/jts/article/view/5801.