(1999). Life lines 2: Pre- Intermediate. Oxford: Oxford University Press.
Trích dẫn kiểu ChicagoLife Lines 2: Pre- Intermediate. Oxford: Oxford University Press, 1999.
MLA引文Life Lines 2: Pre- Intermediate. Oxford: Oxford University Press, 1999.
警告：这些引文格式不一定是100％准确.