Suroto, Azrin. “Influence of Outdoor Source on The Variations of Indoor PM2.5 Concentration and Its Morphological Properties in Roadside School Environment”. International Journal of Integrated Engineering 11, no. 2 (May 6, 2019). Accessed August 7, 2026. https://journal.uthm.edu.my/index.php/ijie/article/view/4245.