@book{14,
	author = {"Beck, Leland L."},
	title = {System software},
	publisher = {Addison Wesley Publishing},
	address = {MenloPark},
	edition = {3rd},
	url = {https://libgen.is/book/index.php?md5=F8C743B594E4CCAE115D3463A49E9E47}
}