Diehl C.
_____. Etudes Byzantines. Paris, 1905.
_____. Figures Byzantines. 2 ser. Paris, 1906 and 1913.
_____. Histoire de l’Empire Byzantin. Paris, 1918.
_____. Choses et Gens de Byzance. Paris, 1926.
Downey G. Constantinople in the Age of Justinian. University of Oklahoma, 1960.
Downey G.
Drapeyron L. L’Empereur Héraclius et l’Empire Byzantin. Paris, 1869.
Drapeyron L.
Dudden F. H. The Life and Times of St Ambrose. 2 vols. Oxford, 1935.
Dudden F. H.
Dunlop D. M. The History of the Jewish Khazars. Princeton, 1954.
Dunlop D. M.
Dvornik F. The Photian Schism: History and Legend. Cambridge, 1948.
Dvornik F.
Ebersolt J. Le Grand Palais de Constantinople et le Livre des Ceremonies. Paris, 1910.
Ebersolt J.
Enciclopedia Italiana. 36 vols. 1929–1939 (with later appendices).
Encyclopaedia Britannica. 11th ed. 29 vols. Cambridge, 1910–1911.
_____. 15th ed. 30 vols. University of Chicago, 1974.