Berman, Ega Taqwali, Ida Hamidah, Budi Mulyanti, and Agus Setiawan. 2021. “Low Cost and Portable Laboratory Kit for Practicum Learning of Air Conditioning Process in Vocational Education”. Journal of Technical Education and Training 13 (3): 133-45. https://penerbit.uthm.edu.my/ojs/index.php/JTET/article/view/9091.