SIMORANGKIR, R. D. .; NAIBAHO, T. R. A. .; SINAMBELA, P. .; PANJAITAN, C. T. . AN ANALYSIS OF MATERIALS IN A STUDENT TEXTBOOK AT SECONDARY SCHOOL IN 8th GRADE. JEE (Journal of English Education), [S. l.], v. 5, n. 2, p. 123–129, 2019. DOI: 10.30606/jee.v5i2.569. Disponível em: https://journal.upp.ac.id/index.php/JEE/article/view/569. Acesso em: 13 jun. 2021.