ARORA, Rita; POONAM. A Comparative Study of Multi-grade Teaching on the Achievement Levels in Hindi and Mathematics of Second Standard in Government and NGO Schools. INDIAN EDUCATIONAL REVIEW, [S. l.], v. 51, n. 2, p. p. 82–93, 2013. Disponível em: http://ejournals.ncert.gov.in/index.php/ier/article/view/2786. Acesso em: 19 jun. 2025.