LEGGO , Carl. Grade Nine Geometry. Journal of the Canadian Association for Curriculum Studies, [S. l.], v. 5, n. 1, 2007. DOI: 10.25071/1916-4467.17025. Disponível em: https://jcacs3.journals.yorku.ca/index.php/jcacs/article/view/17025. Acesso em: 2 feb. 2025.