Dr. Mervin Jay Z. Suaybaguio. “SMS TECHNOLOGY AS DISASTER WARNING AND ALERT SYSTEM AS PERCEIVED BY SELECTED CONSTITUENTS OF DAVAO DEL NORTE”. Researchers World - International Refereed Social Sciences Journal 7, no. 1(1) (August 29, 2021): 38–51. Accessed July 22, 2025. https://www.researchersworld.com/index.php/rworld/article/view/434.