Geoffrey Malaterra, III.41, p. 82. О норманнах и Византии см.: W. McQueen, 'Relations between the Normans and Byzantium 1071–1112', Byzantion 56 (1986), pp. 427–76; H. Taviani-Carozzi, La Terreur du monde – Robert Guiscard et la conquête normande en Italie (Paris, 1997); G. Loud, The Age of Robert Guiscard: Southern Italy and the Norman Conquest (Singapore, 2000).