@book{78061,
	author = {Hertwig, Oscar, and Mitchell, P. Chalmers, Sir},
	title = {The Biological Problem of To-day: Preformation Or Epigenesis? :},
	publisher = {Project Gutenberg,},
	year = {2011},
	address = {Salt Lake City, UT :},
	note = {Release date is 2011-08-27},
	url = {https://www.gutenberg.org/ebooks/37221}
}