GRAVELLS, A. (2014). Achieving your assessor and quality assurance units (TAQA). Sage Publications.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGRAVELLS, Ann. Achieving Your Assessor and Quality Assurance Units (TAQA). Sage Publications, 2014.
एमएलए (9वां संस्करण) प्रशस्ति पत्रGRAVELLS, Ann. Achieving Your Assessor and Quality Assurance Units (TAQA). Sage Publications, 2014.
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