(1970). Nuffield Foundation. Mathematics Teaching Project: Checking Up. W&R Chambers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNuffield Foundation. Mathematics Teaching Project: Checking Up. Edinburgh: W&R Chambers, 1970.
एमएलए (9वां संस्करण) प्रशस्ति पत्रNuffield Foundation. Mathematics Teaching Project: Checking Up. W&R Chambers, 1970.
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