Idzni, Sheikh Iqmal, and Kim Seng Chia. “A Supervisory and Control System for Indoor Lettuce Farming”. International Journal of Integrated Engineering 13, no. 1 (February 28, 2021): 249–259. Accessed August 7, 2026. https://journal.uthm.edu.my/index.php/ijie/article/view/7182.