Hambali, U. et al. 2021. The Philosophical Foundation of English Textbook “Buku Bahasa Inggris” for Vocational High School Student Grade XII 2018 Revision . Jurnal Studi Guru dan Pembelajaran. 4, 2 (Aug. 2021), 360–369. DOI:https://doi.org/10.30605/jsgp.4.2.2021.1263.