Gaya APA
Purnaning,dkk, E, R.
(2014).
Upgrade Toefl Score (Update edition)
.
Jakarta:
CMEDIA.
Gaya MLA
Purnaning,dkk, Estiwi, Retno.
"Upgrade Toefl Score (Update edition)".
Jakarta:
CMEDIA,
2014.
Text.