Gaya APA
Betsis, A., Mamas, L.
(2014).
Succeed in The TOEFL iBT Test Volume 1
.
Jakarta:
Erlangga.
Gaya MLA
Betsis, Andrew., Mamas, Lawrence.
"Succeed in The TOEFL iBT Test Volume 1".
Jakarta:
Erlangga,
2014.
Book.