Kett, J. F. (1994). The pursuit of knowledge under difficulties: From self improvement to adult education in america,1750-1990. Stanford University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKett, Joseph F. The Pursuit of Knowledge Under Difficulties: From Self Improvement to Adult Education in America,1750-1990. California: Stanford University Press, 1994.
एमएलए (9वां संस्करण) प्रशस्ति पत्रKett, Joseph F. The Pursuit of Knowledge Under Difficulties: From Self Improvement to Adult Education in America,1750-1990. Stanford University Press, 1994.
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