Alastair Duncombe. (2021). Cambridge Lower Secondary Maths. Stage 8: Student's Book. Collins.
Lua i Stíl Chicago (17ú heag.)Alastair Duncombe. Cambridge Lower Secondary Maths. Stage 8: Student's Book. London: Collins, 2021.
Lua MLA (9ú heag.)Alastair Duncombe. Cambridge Lower Secondary Maths. Stage 8: Student's Book. Collins, 2021.
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