Gravells, A. (2016). Principles & practices of quality assurance: A guide for internal and external quality assurers in the FE and skills sector. Learning Matters.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Gravells, Ann. Principles & Practices of Quality Assurance: A Guide for Internal and External Quality Assurers in the FE and Skills Sector. SAGE: Learning Matters, 2016.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Gravells, Ann. Principles & Practices of Quality Assurance: A Guide for Internal and External Quality Assurers in the FE and Skills Sector. Learning Matters, 2016.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.