Ryan, L., & Norris, R. (2020). Chemistry For Cambridge International AS & A Level Coursebook (3rd.). Cambridge University Press.
Lua i Stíl Chicago (17ú heag.)Ryan, Lawrie, agus Roger Norris. Chemistry For Cambridge International AS & A Level Coursebook. 3rd. London: Cambridge University Press, 2020.
Lua MLA (9ú heag.)Ryan, Lawrie, agus Roger Norris. Chemistry For Cambridge International AS & A Level Coursebook. 3rd. Cambridge University Press, 2020.
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