H. Subandiyah, H. Supratno, R. Permata, A. Rosyid, E. Minarti, and F. I. Nur Abida, “Teaching Indonesian Language for Foreign Speakers in the State University of Surabaya: Strategies and Challenges”, Rand. Inter. Edu. Ling. Sci. J., vol. 4, no. 2, pp. 193-198, Jun. 2023.