http://www.xatakaciencia.com/libros-que-nos-inspiran/libros-que-nos-inspiran-la-sociedad-del-coste-marginal-cero-de-jeremy-rifkin
http://www.xatakaciencia.com/libros-que-nos-inspiran/libros-que-nos-inspiran-la-sociedad-del-coste-marginal-cero-de-jeremy-rifkin