(2017). PET 6. Cambridge: Cambridge University Press.
Trích dẫn kiểu ChicagoPET 6. Cambridge: Cambridge University Press, 2017.
MLA引文PET 6. Cambridge: Cambridge University Press, 2017.
警告:這些引文格式不一定是100%准確.
(2017). PET 6. Cambridge: Cambridge University Press.
Trích dẫn kiểu ChicagoPET 6. Cambridge: Cambridge University Press, 2017.
MLA引文PET 6. Cambridge: Cambridge University Press, 2017.