Kusumandari, Suwantica. “SUFFIXES USE IN ENGLISH TEXTBOOK FOR SENIOR HIGH SCHOOL ON TENTH GRADE STUDENT’S: A MORPHOLOGY PERSPECTIVE”. Akrab Juara : Jurnal Ilmu-Ilmu Sosial, vol. 6, no. 1, Feb. 2021, pp. 15-30, https://akrabjuara.com/index.php/akrabjuara/article/view/1370.