«Franks, Northmen and Slavs. Identities and State Formation in Early Medieval Europe». Garipzanov, Ildar H.; Geary, Patrick J.; Urbanczyk, Przemyslaw (eds.) Turnhout: Brepols, 2008, 226 pp. - Carvajal Castro, Álvaro (Studia Historica. Historia Medieval, 2011)