UY, M. E.; PEDRAZA, J. G. Operational Efficiency of K to 12 Spiral Approach in Mathematics. SSU - Digital Archive for Theses and Dissertations, [S. l.], v. 36, n. 1, p. 1–139, 2022. Disponível em: https://datd.ssu.edu.ph/index.php/datd/article/view/135. Acesso em: 24 nov. 2024.