APA引文

 Understanding second language acquisition. (2023).  Understanding second language acquisition.  Routledge.

Trích dẫn kiểu Chicago

 Understanding second language acquisition.  Understanding Second Language Acquisition.  Routledge, 2023.

MLA引文

 Understanding second language acquisition.  Understanding Second Language Acquisition.  Routledge, 2023.

警告：这些引文格式不一定是100％准确.