HARWOOD, R. (2014). Cambridge IGCSE: Chemistry coursebook. Cambridge University Press.
Lua i Stíl Chicago (17ú heag.)HARWOOD, Richard. Cambridge IGCSE: Chemistry Coursebook. Cambridge University Press, 2014.
Lua MLA (9ú heag.)HARWOOD, Richard. Cambridge IGCSE: Chemistry Coursebook. Cambridge University Press, 2014.
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