Karl Mannheim 1893-1947
The content for Karl Mannheim are based upon the work of Perdue (1986, pp. 388-393). In addition, please review the following sources.
Mannheim, Karl.  1968. Ideology and Utopia: An Introduction to the Sociology of Knowledge. Translated by Louis Wirth and Edward Shils. New York: Harcourt, Brace & World.
Wolff, Kurt H. 1971. "Introduction." Pp. x-cxxxiii in From Karl Mannheim, ediited by Kurt H. Wolff. New York: Oxford University Press.