@book{6715,
	author = {Niven, Ivan. and Zuckerman, Herbert S.},
	title = {An Introduction to the Theory of Numbers },
	publisher = {Wiley,},
	year = {2011.},
	address = {New York},
	edition = {5th ed.},
	url = {http://www.amazon.com/exec/obidos/ASIN/0471625469/chopaconline-20}
}