Izam, Muhammad Nabihan, et al. “Development of an Integrated IoT-Based Sanitation System for Air Conditioning Split Units”. Research and Innovation in Technical and Vocational Education and Training, vol. 4, no. 2, Dec. 2024, pp. 121-39, https://penerbit.uthm.edu.my/periodicals/index.php/ritvet/article/view/16062.