Belle Cottingham. (2021). Cambridge Lower SEcondary Maths Stage 8: Teacher's Guide. Collins.
Chicago-čujuhus (17. p.)Belle Cottingham. Cambridge Lower SEcondary Maths Stage 8: Teacher's Guide. London: Collins, 2021.
MLA-čujuhus (9. p.)Belle Cottingham. Cambridge Lower SEcondary Maths Stage 8: Teacher's Guide. Collins, 2021.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.