Siti Farah Hussin, Nor Zamira Othman, and Masuria Mohd Tahar. “Development of Portable Water Quality Monitoring System Using Apps”. Politeknik & Kolej Komuniti Journal of Engineering and Technology, vol. 4, no. 1, Nov. 2019, pp. 104-15, https://app.mypolycc.edu.my/journal/index.php/PMJET/article/view/252.