@Book{BDCM20211194336, title = "Tratado elemental y did\'{a}ctico de t\'{a}ctica sublime", author = "Mackenna, Jos\'{e} Ram\'{o}n", publisher = "Madrid : [s.n.]", editor = "[s.n.]", URL = "https://bibliotecavirtualmadrid.comunidad.madrid/bvmadrid_publicacion/es/consulta/registro.do?id=159191", year = "1837", }