Mamaradlo, Mailene Yesha, et al. “Retaining Wall Designs for Soil Instability Control: A Case Study in Sapang Bato, Angeles City, Pampanga”. International Journal of Research in Interdisciplinary Studies, vol. 3, no. 6, June 2025, pp. 173-81, https://journal.ijris.com/index.php/ijris/article/view/174.