title: Era hispánica
text: Goldhizer, Ignác, "Asfar", en Gibb H.A.R., Kramers, J.H., Lévi-Provençal, E., Schacht, J., Lewis, B. y Pellat Ch. (ed.), The Encyclopaedia of Islam, New Edition, Volume I: A-B, páxs. 687-8. Leiden, E.J. Brill, 1960.