SALEH HAJI; YUMIATI. NCTM’s Principles and Standards for Developing Conceptual Understanding in Mathematics . Journal of Research in Mathematics Trends and Technology, [S. l.], v. 1, n. 2, p. 52–60, 2019. DOI: 10.32734/jormtt.v1i2.2836. Disponível em: https://talenta.usu.ac.id/jormtt/article/view/2836. Acesso em: 26 aug. 2025.