(2014). PET 5. Cambridge: Cambridge University Press.
Trích dẫn kiểu ChicagoPET 5. Cambridge: Cambridge University Press, 2014.
MLA引文PET 5. Cambridge: Cambridge University Press, 2014.
警告：這些引文格式不一定是100％准確.
APA引文
(2014). PET 5. Cambridge: Cambridge University Press.
Trích dẫn kiểu ChicagoPET 5. Cambridge: Cambridge University Press, 2014.
MLA引文PET 5. Cambridge: Cambridge University Press, 2014.