@book{112506,
	author = {Burtis, Thomson,},
	title = {Direct methods},
	publisher = {Project Gutenberg,},
	year = {2023},
	address = {Salt Lake City, UT :},
	note = {Release date is 2023-10-03},
	url = {https://archive.org/details/adventure-v-034-n-03-1922-04-30}
}