Gaya APA
Barron's, .
(2011).
IELTS International English Language Testing System
(
Cet.1)
.
Tangerag:
Binapura aksara.
Gaya MLA
Barron's, .
"IELTS International English Language Testing System".
Cet.1
Tangerag:
Binapura aksara,
2011.
Textbook.