Farahdina, N., I. Petrus, and S. Silvhiany. “Parents’ Investment in English for Young Learners: The Case of Elementary School Students Attending Non-Formal English Education”. Indonesian Research Journal in Education |IRJE|, vol. 7, no. 1, June 2023, pp. 158-70, doi:10.22437/irje.v7i1.25149.