Thornbury, S. (2004). Natural grammar. N.Y.: Oxford University Press.
Trích dẫn kiểu ChicagoThornbury, Scott. Natural Grammar. N.Y.: Oxford University Press, 2004.
MLA引文Thornbury, Scott. Natural Grammar. N.Y.: Oxford University Press, 2004.
警告：这些引文格式不一定是100％准确.