Nazaruddin R. Content Analysis Speaking Materials in English Textbook Based on 2013 Curriculum for the First Grade Student at Vocational High School. eduvelop [Internet]. 2017 Oct. 3 [cited 2026 Apr. 17];1(1):49-56. Available from: https://ojs.unsulbar.ac.id/index.php/eduvelop/article/view/2