Calvadores, Carlos B. “A Standardized Achievement Test in Mathematics for Grade 8 Students in the Schools Division of Eastern Samar”. European Journal of Life Safety and Stability (2660-9630) 15 (March 5, 2022): 15-20. Accessed October 5, 2025. http://www.ejlss.indexedresearch.org/index.php/ejlss/article/view/482.