MUSCHLA, J. A.; MUSCHLA, G. R. The Math Teacher’s Problem-A-Day, Grades 4–8: Over 180 Reproducible Pages of Quick Skill Builders. Education Review, [S. l.], 2015. DOI: 10.14507/er.v0.1070. Disponível em: https://edrev.asu.edu/index.php/ER/article/view/1070. Acesso em: 22 may. 2024.