HANDAYANI, T.; MARZUKI, I.; UMAM, N. K. . The Development of Textbooks On Circumference And Area Of Flat Shapes Material For Grade IV Elementary School. IJPSE Indonesian Journal of Primary Science Education, [S. l.], v. 3, n. 1, p. 127–136, 2022. DOI: 10.33752/ijpse.v3i1.3206. Disponível em: https://ejournal.unhasy.ac.id/index.php/ijpse/article/view/3206. Acesso em: 3 jul. 2024.