Suprihatin, R. J., Utami, A. D., & Ahdhianto, E. (2026). Peer-mediated language development in early childhood: A Vygotskian perspective on speech acquisition in children aged 4-5 years. Panicgogy International Journal, 4(1), 32–50. https://doi.org/10.59965/pij.v4i1.269