ETRATA, FLORDELIZA M.; ESTRELLA, DR. ERNIE V. DEVELOPMENT OF INNOVATIVE INSTRUCTIONAL MATERIALS FOR GRADE ONE MATHEMATICS . Lunday: Research Journal of the Graduate School of Bulacan State University, [S. l.], v. 1, n. 1, p. 16, 2026. Disponível em: https://lunday.bulsu.edu.ph/index.php/lunday/article/view/53. Acesso em: 26 feb. 2026.