APA引文

ADRIAN DOFF. (1997). Language in use Upper - intermediate (0 521 55550 7). Cambridge.

Trích dẫn kiểu Chicago

ADRIAN DOFF. Language in Use Upper - Intermediate (0 521 55550 7). Cambridge, 1997.

MLA引文

ADRIAN DOFF. Language in Use Upper - Intermediate (0 521 55550 7). Cambridge, 1997.

警告：這些引文格式不一定是100％准確.