Harrison, M. (1998). Proficiency practice tests. Oxford: Oxford University Press.
Trích dẫn kiểu ChicagoHarrison, Mark. Proficiency Practice Tests. Oxford: Oxford University Press, 1998.
MLA引文Harrison, Mark. Proficiency Practice Tests. Oxford: Oxford University Press, 1998.
警告：这些引文格式不一定是100％准确.