Gaya APA
(ETS), E, T, S. (2016).
Official TOEFL iBT Tests Volume 2 / 托福考试官方真题集 2 (2nd Edition).
Beijing (北京市):
群言出版社.
Gaya MLA
(ETS), Educational, Testing, Service.
"Official TOEFL iBT Tests Volume 2 / 托福考试官方真题集 2".
2nd Edition
Beijing (北京市):
群言出版社,
2016.
Text.