Implementation of Magic Book to Improve Critical Thinking and Mathematical Communication Abilities of Elementary School Students. Riemann: Research of Mathematics and Mathematics Education, [S. l.], v. 7, n. 1, p. 45–52, 2025. DOI: 10.38114/reimann.v7i1.86. Disponível em: http://journal.sanagustin.ac.id/index.php/reimann/article/view/86.. Acesso em: 18 apr. 2026.