Trudgill, P. (1979). Sociolinguistics: An introduction. N.Y.: Penguin Books.
Trích dẫn kiểu ChicagoTrudgill, Peter. Sociolinguistics: An Introduction. N.Y.: Penguin Books, 1979.
MLA引文Trudgill, Peter. Sociolinguistics: An Introduction. N.Y.: Penguin Books, 1979.
警告：這些引文格式不一定是100％准確.