@book{60875,
	author = {Clippinger, D. A.},
	title = {The Head Voice and Other Problems: Practical Talks on Singing},
	publisher = {Project Gutenberg,},
	year = {2006},
	address = {Salt Lake City, UT :},
	note = {Release date is 2006-10-07},
	url = {https://www.gutenberg.org/ebooks/19493}
}