Gurut, W. ., H. Wahid, D. H. . Burhanuddin, and E. J. . Mohamad. “Design of IoT Based Air Quality Monitoring Device With Optimal Solar-Based Power Source: Worldey Gurut, Herman Wahid*, Dirman Hanafi Burhanuddin, Elmy Johana Mohamad”. Journal of Tomography System and Sensor Application, vol. 4, no. 2, Nov. 2021, pp. 21-31, http://tssa.my/index.php/jtssa/article/view/164.