Ratcliff, B. (2008). AS Level and A Level: Chemistry. Cambridge University Press.
Lua i Stíl Chicago (17ú heag.)Ratcliff, Brian. AS Level and A Level: Chemistry. Cambridge University Press, 2008.
Lua MLA (8ú heag.)Ratcliff, Brian. AS Level and A Level: Chemistry. Cambridge University Press, 2008.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.