SIMANJUNTAK, K. V.; DAMANIK, B. A. R. THE EFFECT OF USING MOTHER TONGUE ON THE DEVELOPMENT OF COGNITIVE ABILITIES AND SECOND LANGUAGE IN EARLY CHILDHOOD. Sindoro: Cendikia Pendidikan, [S. l.], v. 8, n. 11, p. 1–10, 2024. DOI: 10.9644/sindoro.v8i11.7547. Disponível em: https://ejournal.warunayama.org/index.php/sindorocendikiapendidikan/article/view/7547. Acesso em: 5 jul. 2025.