Ristati -. The difficulties in pronunciation of fricatives [f] and [v] by learners of English whose first language is Dayak Ngaju: Applied linguistics. IJLLC [Internet]. 2017 Jan. 22 [cited 2026 May 1];3(1):47-55. Available from: https://sloap.org/journals/index.php/ijllc/article/view/190