Development of DelTalk (an English learning application) using Agile Method by Tegar Arifin Prasetyo, Monalisa Pasaribu, Tiurma Lumban Gaol, Togu Novriansyah Turnip, Juli Yanti Damanik, Andree Panjaitan, Mei Pane, Nathan Fernando Lumban Tobing, Lilis Marito Pardosi, Timothy Timothy, Yohana Sihombing

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