Belle Cottingham. (2021). Cambridge Lower SEcondary Maths Stage 8: Teacher's Guide. Collins.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBelle Cottingham. Cambridge Lower SEcondary Maths Stage 8: Teacher's Guide. London: Collins, 2021.
एमएलए (9वां संस्करण) प्रशस्ति पत्रBelle Cottingham. Cambridge Lower SEcondary Maths Stage 8: Teacher's Guide. Collins, 2021.
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