Gaya APA
Erna, F., Sumiratingratri, R.
(2017).
I Speak English
.
Jakarta:
Cahaya Pustaka Raga.
Gaya MLA
Erna, Fitrini., Sumiratingratri, Ratih.
"I Speak English".
Jakarta:
Cahaya Pustaka Raga,
2017.
Text.