TY - BOOK A1 - Mannheim, Karl T1 - Ideology and Utopia. An Introduction to the Sociology of Knowledge. London (Routledge and Kegan Paul) 1936. Y1 - 1936 N1 - Ex libris Marco Bacciagaluppi ER - TY - BOOK A1 - Mannheim, Karl T1 - Systematic Sociology. An Introduction to the Study of Society. Edited by J. S. Erös and W. A. C. Stewart. New York (Grove Press) 1957. Y1 - 1957 N1 - Ex libris Marco Bacciagaluppi ER -