Flori & Tucker 2019, p. 999. Flori, Jean; Tucker, Spencer (2019). "King Philip II". In Tucker, Spencer C. (ed.). Middle East Conflicts from Ancient Egypt to the 21st Century: An Encyclopedia and Document Collection. ABC-CLIO. p. 999. ISBN978-1-440-85352-4.
Hayes 2004, p. 135. "Philip Augustus 'Dieudonné', [...] as this epithet demonstrates, was thought to have been given to Louis VII by God, because Louis had been married three times and had to wait many years for the birth of a son". Hayes, Dawn Marie (2004). "Christian Sanctuary and Repository of France's Political Culture: The Construction of Holliness and Masculinity at the Royal Abbey of Saint-Denis, 987–1328". In Cullum, P.; Lewis, K. (eds.). Holiness and Masculinity in the Middle Ages. University of Wales Press. p. 135. ISBN978-0-708-31894-2. OL9655960M.
Verbruggen 1997, pp. 245–247. Verbruggen, J. F. (1997) [1954]. De Krijgskunst in West-Europa in de Middeleeuwen, IXe tot begin XIVe eeuw [The Art of Warfare in Western Europe During the Middle Ages: From the Eighth Century to 1340]. Translated by Willard, S. (2nd ed.). Suffolk: Boydell Press. ISBN0-8511-5630-4. OL995963M.
Verbruggen 1997, pp. 252–253. Verbruggen, J. F. (1997) [1954]. De Krijgskunst in West-Europa in de Middeleeuwen, IXe tot begin XIVe eeuw [The Art of Warfare in Western Europe During the Middle Ages: From the Eighth Century to 1340]. Translated by Willard, S. (2nd ed.). Suffolk: Boydell Press. ISBN0-8511-5630-4. OL995963M.
Verbruggen 1997, p. 253. Verbruggen, J. F. (1997) [1954]. De Krijgskunst in West-Europa in de Middeleeuwen, IXe tot begin XIVe eeuw [The Art of Warfare in Western Europe During the Middle Ages: From the Eighth Century to 1340]. Translated by Willard, S. (2nd ed.). Suffolk: Boydell Press. ISBN0-8511-5630-4. OL995963M.
Verbruggen 1997, p. 255. Verbruggen, J. F. (1997) [1954]. De Krijgskunst in West-Europa in de Middeleeuwen, IXe tot begin XIVe eeuw [The Art of Warfare in Western Europe During the Middle Ages: From the Eighth Century to 1340]. Translated by Willard, S. (2nd ed.). Suffolk: Boydell Press. ISBN0-8511-5630-4. OL995963M.
According to Bernard Guenée, the style rex Francie is recorded since 1190, which is supported by several letters and documents.[1][2] According to Dauvit Broun, the title was not officially adopted by the royal chancery until 1254, during the reign of king Louis IX.[3]John W. Baldwin argues that Philip only ruled as rex Francorum, and that rex Francie was used in unofficial documents.[4]