@Book{BVMC:621168, author = {Constantino VII, Emperador de Oriente}, title = {Constantini Imperatoris Porphyrogeniti De administrando imperio ad Romanum f.}, url = {https://www.cervantesvirtual.com/obra/constantini-imperatoris-porphyrogeniti-de-administrando-imperio-ad-romanum-f} }