@book{VillaLever2012, author = {Villa Lever, Lorenza}, year = {2012}, language = {spa}, copyright = {http://www.fu-berlin.de/sites/refubium/rechtliches/Nutzungsbedingungen}, title = {Flujos de saber en cincuenta aƱos de Libros de Texto Gratuitos de Historia}, url = "http://dx.doi.org/10.17169/refubium-23291", }