@book{23720,
	author = {Crampton, R. J.  and Oxford, Edmund Hall},
	title = {A concise history of Bulgaria /},
	publisher = {Cambridge University Press,},
	year = {2005},
	address = {Cambridge ;},
	edition = {2nd edition},
	url = {http://www.loc.gov/catdir/enhancements/fy0642/2005045765-d.html}
}