Flannigan, E. (2009). Grammar friend 3. Oxford University Press.
Trích dẫn kiểu ChicagoFlannigan, Eileen. Grammar Friend 3. Oxford University Press, 2009.
MLA引文Flannigan, Eileen. Grammar Friend 3. Oxford University Press, 2009.
警告：這些引文格式不一定是100％准確.