Jusrin Efendi Pohan JEP. Second Language Acquisition Three Year Old Children in the Angkola Batak Tribe. Prologue [Internet]. 2023Oct.3 [cited 2024May20];9(2):276-85. Available from: https://prologue.sastra.uniba-bpn.ac.id/index.php/jurnal_prologue/article/view/118