U. Hambali, A. Rajab, R. Rasmi, and W. Wahyuddin, “The Philosophical Foundation of English Textbook ‘Buku Bahasa Inggris’ for Vocational High School Student Grade XII 2018 Revision ”, J. Studi Guru Pembelajaran, vol. 4, no. 2, pp. 360-369, Aug. 2021.