@book{50667,
	author = {Berelson, Bernard, and Janowitz, Morris,},
	title = {Reader in public opinion and communication.},
	publisher = {Free Press},
	year = {[1966]},
	address = {New York,},
	edition = {2d ed.},
	url = {http://swbplus.bsz-bw.de/bsz002340852inh.htm}
}