@book{90815,
	author = {Wagner, Richard, and Barthèlemy, Edmond,},
	title = {La Tétralogie de l'Anneau du Nibelung},
	publisher = {Project Gutenberg,},
	year = {2015},
	address = {Salt Lake City, UT :},
	note = {Wikipedia page about this book: https://en.wikipedia.org/wiki/Der_Ring_des_Nibelungen},
	url = {https://www.gutenberg.org/ebooks/49977}
}