Roma Rejeki Nami Saragih, Christian Neni Purba, and Asima Rohana Sinaga, “The Effect Of Jigsaw Teachnique On Students’ Writing Skill At Eeventh Grade Of SMA Negeri 5 Pematang Siantar”, JIPSI, vol. 2, no. 4, pp. 547–555, Nov. 2023.