Flannigan, E. (2010). Grammar friend 6. Oxford University Press.
Trích dẫn kiểu ChicagoFlannigan, Eileen. Grammar Friend 6. Oxford University Press, 2010.
MLA引文Flannigan, Eileen. Grammar Friend 6. Oxford University Press, 2010.
警告：這些引文格式不一定是100％准確.