Olive Joy F. Andaya. “FACTORS THAT AFFECT MATHEMATICS ACHIEVEMENTS OF STUDENTS OF PHILIPPINE NORMAL UNIVERSITY – ISABELA CAMPUS”. Researchers World - International Refereed Social Sciences Journal 5, no. 4 (September 8, 2021): 83–91. Accessed August 5, 2025. https://www.researchersworld.com/index.php/rworld/article/view/830.