@book{44022,
	author = {Luther, Martin,},
	title = {Concerning Christian Liberty; with Letter of Martin Luther to Pope Leo X.},
	publisher = {Project Gutenberg,},
	year = {2006},
	address = {Salt Lake City, UT :},
	note = {Wikipedia page about this book: https://en.wikipedia.org/wiki/On_the_Freedom_of_a_Christian},
	url = {https://www.gutenberg.org/ebooks/1911}
}