Robert the Monk, VII.20, p. 176.

Barber and Bate, Letters, p. 20.

Ibid., pp. 22–5.

Matthew of Edessa, II.114, p. 167. О Сумельском монастыре см.: Regulations of Nikon of the Black Mountain in J. Thomas and A. Constantinides Hero (eds.), Byzantine Monastic Foundation Documents, 5 vols. (Washington, DC, 2000), pp. 377–424. См. также: Typikon of Nikon of the Black Mountain for the Monastery and Hospice of the Mother of God tou Roidiou in ibid., pp.425–39.