@book{131029,
	author = {Crystal, David,},
	title = {The Cambridge encyclopedia of language /},
	publisher = {Cambridge University Press,},
	year = {1987.},
	address = {Cambridge ;},
	edition = {3rd ed.},
	note = {Previous ed.: 1997.},
	url = {http://www.loc.gov/catdir/enhancements/fy1101/2010502889-d.html}
}