Petrias H. Peningkatan Kemampuan Menulis Surat Resmi Siswa Xii Ipa 1 MA USB Filial Man Batam . JKIP [Internet]. 2021Oct.11 [cited 2025Jul.18];2(1):1-6. Available from: http://www.journal.al-matani.com/index.php/jkip/article/view/176