@book{198930,
	author = {Johnson, David W., and Johnson, Roger T.},
	title = {Cómo reducir la violencia en las escuelas},
	publisher = {Editorial Paidós},
	year = {reimp., 2004.},
	series = {Paidos Educador},
	address = {Buenos Aires},
	url = {http://lcweb.loc.gov/catdir/toc/95-32482.html}
}