@book{13288,
	author = {Perniss, Pamela, and ebrary, Inc.},
	title = {Visible variation},
	publisher = {Mouton de Gruyter,},
	year = {c2007.},
	series = {Trends in linguistics. Studies and monographs,},
	address = {Berlin ;},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10256598}
}