Rani Wulansari Ariana, and Fajar Sidik. “KEIGO PADA KORESPONDENSI BISNIS BAHASA JEPANG”. Jurnal Sastra - Studi Ilmiah Sastra, Vol. 15, no. 1, June 2025, pp. 32-43, http://45.118.112.109/ojspasim/index.php/sastra/article/view/524.