@book{4647,
	author = {Trudgill, Peter.},
	title = {Sociolinguistics :},
	publisher = {Penguin,},
	year = {2000.},
	address = {London ;},
	edition = {4th ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy1203/2001525746-b.html}
}