@book{116026,
	author = {Valkenstein, Kees,},
	title = {De verdwijn-machine},
	publisher = {Project Gutenberg,},
	year = {2025},
	address = {Salt Lake City, UT :},
	note = {Illustrated by the author.},
	url = {https://www.gutenberg.org/ebooks/75301}
}