Kett, J. F. (1994). The pursuit of knowledge under difficulties: From self improvement to adult education in america,1750-1990. Stanford University Press.
Chicago-čujuhus (17. p.)Kett, Joseph F. The Pursuit of Knowledge Under Difficulties: From Self Improvement to Adult Education in America,1750-1990. California: Stanford University Press, 1994.
MLA-čujuhus (9. p.)Kett, Joseph F. The Pursuit of Knowledge Under Difficulties: From Self Improvement to Adult Education in America,1750-1990. Stanford University Press, 1994.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.