Напр.: Michael Angold, The Byzantine Empire 1025–1204 (London, 1984), pp. 112–13; France, Victory in the East, pp. 155–6; J. Flori, La Première Croisade: l'Occident chrétien contre l'Islam aux origines des idéologies occidentales (Paris, 2001), p. 64; P. Magdalino, 'The Medieval Empire (780–1204) ' in C. Mango (ed.), The Oxford History of Byzantium, p. 185; J. Harris, Byzantium and the Crusades (London, 2003), pp. 47, 55. Phillips, Holy Warriors, p.15.