@book{56356,
	author = {Upton, George P.},
	title = {The Standard Operas: Their Plots, Their Music, and Their Composers :},
	publisher = {Project Gutenberg,},
	year = {2005},
	address = {Salt Lake City, UT :},
	note = {Release date is 2005-02-08},
	url = {https://www.gutenberg.org/ebooks/14968}
}