Verdiansyah, M. Z., S. Sahiruddin, and P. D. D. Degeng. “Text Complexity in Reading Texts of Indonesian Senior High School English Textbooks Using Coh- Metrix 3.0”. Diglossia: Jurnal Kajian Ilmiah Kebahasaan Dan Kesusastraan, vol. 12, no. 1, May 2020, pp. 1-10, doi:10.26594/diglossia.v12i1.1925.