Md Ralib, A. A. ., N. L. . Lukman Hekiem, M. A. MH, F. B. Ahmad, R. Ab Rahim, N. F. . Za’bah, and G. Sugandi. “Chitosan Coating on Quartz Crystal Microbalance Gas Sensor for Isopropyl Alcohol and Acetone Detection”. International Journal of Integrated Engineering, vol. 14, no. 3, June 2022, pp. 241-9, https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/10748.