Putri, A. ., Deliani , S. . dan Syahputra , A. . (2022) “THE EFFECT OF PROBLEM BASED LEARNING MODEL ON THE ABILITY TO WRITE PROCEDURE TEXT IN STUDENTS OF CLASS XI SMA AL–MAKSUM CINTA RAKYAT STUDY YEAR 2021-2022”, LUMBUNG AKSARA, 1(2), hlm. 1–10. Tersedia pada: http://siakad.univamedan.ac.id/ojs/index.php/lumbung_aksara/article/view/355 (Diakses: 18 Agustus 2025).