STANTON, Charles D. The Battle of Civitate: A Plausible Account. Journal of Medieval Military History. Volume XI. 2013, s. 27–28. Dostupné online [cit. 2023-08-03]. (anglicky)
GREEN, Judith A. The Normans. Power, Conquest and Culture in 11th Century Europe. New Haven, London: Yale University Press, 2022. Dostupné online. ISBN9780300180336. S. 70–72. (anglicky)
HILL, Paul. The Norman Commanders. Masters of Warfare 911-1135. Barnsley: Pen and Sword Military, 2015. Dostupné online. ISBN1783462280. S. 22–23. (anglicky)
D’AMATO, Raffaele; SALIMBETI, Andrea. The Normans in Italy 1016–1194. Oxford, New York: Osprey Publishing, 2020. Dostupné online. ISBN978-1-4728-3946-6. S. 6. (anglicky)