Riley, P. (2011). Cambridge Checkpoint Science 2 (1st.). Cambridge University Press.
Cita Chicago Style (17a ed.)Riley, Peter. Cambridge Checkpoint Science 2. 1st. London: Cambridge University Press, 2011.
Cita MLA (9a ed.)Riley, Peter. Cambridge Checkpoint Science 2. 1st. Cambridge University Press, 2011.
Precaución: Estas citas no son 100% exactas.