APA (7 वां संस्करण) प्रशस्ति पत्र
Gravells, A. (2012). What is teaching in the lifelong learning sector? Sage.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Gravells, Ann. What Is Teaching in the Lifelong Learning Sector? Los Angeles: Sage, 2012.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Gravells, Ann. What Is Teaching in the Lifelong Learning Sector? Sage, 2012.
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