@book{88700,
	author = {Luther, Martin, and Höfer, Conrad,},
	title = {Martin Luthers Geistliche Lieder},
	publisher = {Project Gutenberg,},
	year = {2015},
	address = {Salt Lake City, UT :},
	note = {Wikipedia page about this book: https://sv.wikipedia.org/wiki/Geistliche_Lieder},
	url = {https://www.gutenberg.org/ebooks/47861}
}