@book{61149,
	author = {Various},
	title = {Encyclopaedia Britannica, 11th Edition, "Bulgaria" to "Calgary" :},
	publisher = {Project Gutenberg,},
	year = {2006},
	address = {Salt Lake City, UT :},
	note = {Release date is 2006-11-17},
	url = {https://www.gutenberg.org/ebooks/19846}
}