Riana, Riana, and Lely Sabda Putriani Hulu. “Peningkatan Kemampuan Menulis Surat Dinas Melalui Model Cooperative Learning”. Educativo: Jurnal Pendidikan 1, no. 2 (November 15, 2022): Page: 552–558. Accessed November 23, 2024. https://www.educativo.marospub.com/index.php/journal/article/view/76.