Purba JTNB. THE USE OF COOPERATIVE LEARNING TO ENHANCE STUDENTS SPEAKING ABILITY IN ONLINE CLASSROOM. RETAIN : J. Res. Engl. Lang. Teach. [Internet]. 2022 Jan. 20 [cited 2025 Jun. 29];9(03):124-31. Available from: https://ejournal.unesa.ac.id/index.php/retain/article/view/41935