Prasetyo TA, Pasaribu M, Gaol TL, Turnip TN, Damanik JY, Panjaitan A, Pane M, Tobing NFL, Pardosi LM, Timothy T, Sihombing Y. Development of DelTalk (an English learning application) using Agile Method. J. teknol. inf. pendidik. [Internet]. 2023Oct.25 [cited 2025Nov.7];16(1):259-73. Available from: http://tip.ppj.unp.ac.id/index.php/tip/article/view/662