Jailani, Mohamad Hairul Aiman, et al. “Development of Water Sound Analyzer for An Automatic Fertilizer System in Agriculture Industry”. Evolution in Electrical and Electronic Engineering, vol. 3, no. 2, Nov. 2022, pp. 351-9, https://publisher.uthm.edu.my/periodicals/index.php/eeee/article/view/8581.