@book{40694,
	author = {Holmes, Janet,},
	title = {An introduction to sociolinguistics /},
	publisher = {Routledge,},
	year = {2013.},
	address = {USA},
	edition = {4th ed.},
	note = {Includes Index},
	url = {http://www.loc.gov/catdir/toc/ecip0726/2007036870.html}
}