@book{7699,
	author = {Date, C. J.},
	title = {An introduction to database systems},
	publisher = {Pearson Education Publisher},
	year = {2006},
	address = {New dehli},
	edition = {8th},
	url = {https://libgen.is/book/index.php?md5=0647DA6CC895DEDB7EBEA75935556EC1}
}