@book{10715,
	author = {Enderton, Herbert. and Enderton, Herbert B.},
	title = {A mathematical introduction to logic, second edition /},
	publisher = {Academic Press,},
	year = {2006.},
	address = {[S.l.] :},
	edition = {2nd ed.},
	url = {http://www.amazon.com/exec/obidos/ASIN/0122384520/chopaconline-20}
}