Zulkiffli, Nafisah, et al. “Monitoring and Watering System for Indoor Gardening Using Internet of Things (IoT)”. Evolution in Electrical and Electronic Engineering, vol. 2, no. 2, Nov. 2021, pp. 354-62, https://penerbit.uthm.edu.my/periodicals/index.php/eeee/article/view/3885.