Pople, S., & Williams, M. (1995). Science to GCSE. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Pople, Stephen, agus Michael Williams. Science to GCSE. Oxford: Oxford University Press, 1995.
Lua MLA (9ú heag.)Pople, Stephen, agus Michael Williams. Science to GCSE. Oxford University Press, 1995.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.