@book{6951,
	author = {Singh, S.},
	title = {Database System Concepts},
	publisher = {Dorling kindersley (india) Pvt, Ltd.,},
	year = {2009.},
	address = {New Delhi: },
	edition = {2nd ed.},
	url = {https://images-eu.ssl-images-amazon.com/images/I/41YdPjGzg9L.jpg}
}