Enock, Omar U., and Jonald L. Pimentel. “Does Retention Interval Matters in Mathematics Performance?”. International Journal of Sciences: Basic and Applied Research (IJSBAR) 54, no. 3 (October 8, 2020): 32–41. Accessed December 5, 2025. https://gssrr.org/JournalOfBasicAndApplied/article/view/11828.