Littlejohn, A. (1999). Cambridge English worldwide: Workbook. Cambridge, UK: Cambridge University Press.
Trích dẫn kiểu ChicagoLittlejohn, Andrew. Cambridge English Worldwide: Workbook. Cambridge, UK: Cambridge University Press, 1999.
MLA引文Littlejohn, Andrew. Cambridge English Worldwide: Workbook. Cambridge, UK: Cambridge University Press, 1999.
警告：這些引文格式不一定是100％准確.