Dan Michael A, Cortez, Molina Charito M, Abante Marmelo V., and Santos Myra S. “Nullpest: A Mobile Application of Agricultural Pest Locator Using Sonar Sensor Set-up”. International Journal of Engineering and Technology 7, no. 3.29 (August 24, 2018): 107–109. Accessed May 19, 2025. https://mail.sciencepubco.com/index.php/IJET/article/view/18535.