SURYA IRAWAN A. INSTRUCTIONAL STRATEGIES SELECTED BY TEACHER TO HELP MENTALLY RETARDED STUDENTS OF SPECIAL SCHOOL FOR THEIR ENGLISH VOCABULARY DEVELOPMENT. RETAIN : J. Res. Engl. Lang. Teach. [Internet]. 2014 Oct. 1 [cited 2025 Dec. 17];2(3). Available from: https://ejournal.unesa.ac.id/index.php/retain/article/view/9774