@book{6850,
	author = {Beall, J. C.},
	title = {Logic :},
	publisher = {Routledge.,},
	year = {2010},
	address = {London:},
	note = {Includes bibliographical references and index.},
	url = {http://bvbm2.bib-bvb.de:8993/F?func=service&doc_library=BVB01&doc_number=018992292&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA}
}