Riley, P. (2011). Cambridge Checkpoint Science 2 (1st.). Cambridge University Press.
芝加哥风格引文Riley, Peter. Cambridge Checkpoint Science 2. 1st. London: Cambridge University Press, 2011.
MLA引文Riley, Peter. Cambridge Checkpoint Science 2. 1st. Cambridge University Press, 2011.
警告：这些引文格式不一定是100％准确.