Indra Perkasa, K., Emzir, E., Dewanti, R., & Dewanti, R. (2018). ENHANCING ENGLISH SPEAKING SKILL THROUGH JIGSAW COOPERATIVE LEARNING (Action Research In X Class of MIA SMA Negeri 2 DKI Jakarta). Bahtera: Jurnal Pendidikan Bahasa Dan Sastra, 17(2), 46–53. https://doi.org/10.21009/BAHTERA.172.05