Prihatnasari, Ferdias. “GRAMMAR FOCUS ANALYSIS IN ENGLISH TEXTBOOK FOR SENIOR HIGH SCHOOL ON TENTH GRADE STUDENT’S: A SYNTAX PERSPECTIVE”. Akrab Juara : Jurnal Ilmu-Ilmu Sosial, vol. 5, no. 4, Nov. 2020, pp. 14-26, https://akrabjuara.com/index.php/akrabjuara/article/view/1280.