UPADHYAY, Sunil Kumar. Concept Attainment in Mathematics and Its Predictors. INDIAN EDUCATIONAL REVIEW, [S. l.], v. 57, n. 2, p. p. 91–105, 2019. Disponível em: https://ejournals.ncert.gov.in/index.php/ier/article/view/3192. Acesso em: 6 oct. 2025.