@book{57363,
	author = {Hildebrand,},
	title = {Camera Obscura},
	publisher = {Project Gutenberg,},
	year = {2005},
	address = {Salt Lake City, UT :},
	note = {Wikipedia page about this book: https://nl.wikipedia.org/wiki/Camera_Obscura_(boek)},
	url = {https://www.gutenberg.org/ebooks/15975}
}