Simmons, N. (2009). First friends 1 numbers book. Oxford University Press.
Trích dẫn kiểu ChicagoSimmons, Naomi. First Friends 1 Numbers Book. Oxford University Press, 2009.
MLA引文Simmons, Naomi. First Friends 1 Numbers Book. Oxford University Press, 2009.
警告：这些引文格式不一定是100％准确.