Saragih, M. “The Effect of Small-Group Discussion through the Ability to Write Procedure Texts by Seventh Grade Students of SMP Negeri 1 Atap Tampahan in Academic Year 2018/2019: The Effect of Small-Group Discussion through the Ability to Write Procedure Texts by Seventh Grade Students of SMP Negeri 1 Atap Tampahan in Academic Year 2018/2019”. Jurnal Mantik, vol. 3, no. 4, Feb. 2020, pp. 575-8, https://iocscience.org/ejournal/index.php/mantik/article/view/630.