Shah Slamet, M. F. ., N. A. Zambri, and N. Salim. “Air-Conditioning Unit Harvesting Energy Using DC Generator”. Progress in Engineering Application and Technology, vol. 1, no. 1, Dec. 2020, pp. 166-72, https://publisher.uthm.edu.my/periodicals/index.php/peat/article/view/245.