Gaya APA

Downie, M., Gray, D. (2019). English Elevator International : Intermediate (Second Edition) (Ed. 2). : ASTA Ilmu Sukses.

Gaya MLA

Downie, Michael., Gray, David. "English Elevator International : Intermediate (Second Edition)". Ed. 2 : ASTA Ilmu Sukses, 2019. Text.