Yarlin Nurlina Telaumbanua, et al. “Increasing Eleventh Graders’ Collaborative Skill in English Learning Through the Jigsaw Model at SMK Negeri 2 Gunungsitoli”. Jurnal Pendidikan Dan Sastra Inggris, vol. 5, no. 3, Sept. 2025, pp. 90-101, doi:10.55606/jupensi.v5i3.5938.