Gaya APA
Norris, L., Gray, L.
(2013).
English Elevator International Teacher's Book 1
.
Jakarta:
Asta Ilmu Sukses.
Gaya MLA
Norris, Lucy., Gray, Leanne.
"English Elevator International Teacher's Book 1".
Jakarta:
Asta Ilmu Sukses,
2013.
Text.