Gaya APA
IELTS : Practice Exams. (2013).
New York:
Barrons.
Gaya Chicago
IELTS : Practice Exams.
Edisi kedua.
New York:
Barrons,
2013.
Printed Book.
Gaya MLA
IELTS : Practice Exams.
Edisi kedua.
New York:
Barrons,
2013.
Printed Book.
Gaya Turabian
IELTS : Practice Exams.
New York:
Barrons,
2013.
Printed Book.