SINGH, Dhruba Bahadur. The Letter Grading System: A Perception and Practice at Secondary Level. NPRC Journal of Multidisciplinary Research, [S. l.], v. 2, n. 7, p. 228–246, 2025. DOI: 10.3126/nprcjmr.v2i7.81623. Disponível em: https://nepjol.info/index.php/nprcjmr/article/view/81623. Acesso em: 7 dec. 2025.