@book{6782,
	author = {Beer, Ferdinand.},
	title = {Vector mechanics for engineers :},
	publisher = {Mcgraw-Hill,},
	year = {2004.},
	series = {Nineth.},
	address = {New York:},
	edition = {7th ed},
	url = {http://www.amazon.com/exec/obidos/ASIN/B006RQSUZS/chopaconline-20}
}