Downie, M., & Gray, D. (2019). English elevator international upper intermediate student's book. ASTA Ilmu Sukses.
Chicago Style (17th ed.) CitationDownie, Michael, and David Gray. English Elevator International Upper Intermediate Student's Book. ASTA Ilmu Sukses, 2019.
MLA (8th ed.) CitationDownie, Michael, and David Gray. English Elevator International Upper Intermediate Student's Book. ASTA Ilmu Sukses, 2019.
Warning: These citations may not always be 100% accurate.