Riley, P. (2011). Cambridge Checkpoint Science 2 (1st.). Cambridge University Press.
Lua i Stíl Chicago (17ú heag.)Riley, Peter. Cambridge Checkpoint Science 2. 1st. London: Cambridge University Press, 2011.
Lua MLA (9ú heag.)Riley, Peter. Cambridge Checkpoint Science 2. 1st. Cambridge University Press, 2011.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.