F. Wulandari and K. Rustipa, “ENGLISH DIPTHONGS [eɪ], [aɪ], [aʊ] PRONUNCIATION PROBLEMS ENCOUNTERED BY SEVENTH SEMESTER STUDENTS OF ENGLISH LITERATURE STUDY PROGRAM IN STIKUBANK UNIVERSITY ACADEMIC YEAR OF 2018”, bb, vol. 17, no. 2, pp. 38-41, Sep. 2022.