@book{13246,
	author = {Challis, Bradford H. and ebrary, Inc.},
	title = {Stratification in cognition and consciousness},
	publisher = {J. Benjamins,},
	year = {c1999.},
	series = {Advances in consciousness research,},
	address = {Amsterdam ;},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10014707}
}