SURYA IRAWAN, A. (2014) “INSTRUCTIONAL STRATEGIES SELECTED BY TEACHER TO HELP MENTALLY RETARDED STUDENTS OF SPECIAL SCHOOL FOR THEIR ENGLISH VOCABULARY DEVELOPMENT”, RETAIN : Journal of Research in English Language Teaching, 2(3). Available at: https://ejournal.unesa.ac.id/index.php/retain/article/view/9774 (Accessed: 17 December 2025).