@book{44948,
	author = {Darwin, Charles,},
	title = {The Variation of Animals and Plants under Domestication — Volume 2},
	publisher = {Project Gutenberg,},
	year = {2001},
	address = {Salt Lake City, UT :},
	note = {Wikipedia page about this book: https://en.wikipedia.org/wiki/The_Variation_of_Animals_and_Plants_Under_Domestication},
	url = {https://www.gutenberg.org/ebooks/2872}
}