MOCHAMAD PRATAMA A. Problem-Based Learning in Teaching Writing Hortatory Exposition Text to Eleventh Graders. RETAIN : J. Res. Engl. Lang. Teach. [Internet]. 2018 Jul. 12 [cited 2025 Jun. 28];6(1). Available from: https://ejournal.unesa.ac.id/index.php/retain/article/view/24046