@book{4444,
	author = {Berkowski, George},
	title = {How to build a billion dollar app},
	publisher = {Platkus},
	year = {2014},
	address = {United Kingdon },
	url = {https://libgen.is/book/index.php?md5=98F1071C6B8ED1BCEB5B9D40D264A126}
}