Anwar, N., A. M. Widodo, V. Tundjungsari, A. Ichwani, K. H. Muiz, and Y. Yulhendri. “Sistem Pemantauan Level Keasaman Dan Total Dissolved Solids Limbah Cair Berbasis Internet of Things (IoT)”. Prosiding SISFOTEK, vol. 5, no. 1, Sept. 2021, pp. 21 -26, http://seminar.iaii.or.id/index.php/SISFOTEK/article/view/252.