Sari, L. K., I. A. . Nusen, and B. B. C. Onwuagboke. “Code-Mixing and Bilingualism in Indonesian Language Classrooms: A Case Study of Seventh-Grade Students in Riau”. Pijar : Jurnal Penelitian Bidang Pendidikan Dan Pembelajaran, vol. 5, no. 1, July 2025, pp. 24-34, doi:10.56393/pijar.v5i1.3396.