Busby 1983, p. 15, citing Fourrier 1964 Busby, Keith, ed. (1983). Roman des eles: The anonymous Ordene de chevalerie(Google preview). Utrecht Publications in General and Comparative Literature. Vol. 17. Amsterdam; Philadelphia: J. Benjamins Pub. Co. ISBN9027222029. (with translation) Fourrier, Anthime (1964). "Raoul de Hodenc:est-ce lui?". Mélanges de linguistique romane et de philologie médiévale offerts á M. Maurice Delbouille. Vol. II. Gembloux, Belgium: Duculot. pp. 165–193.
Lacy 2013, New Arthurian Encyclopedia, p.379, "Raoul de Houdenc", contributed by Keith Busby (KB). Busby, Keith (2013) [1986]. "Raoul de Houdenc". In Lacy, Norris J. (ed.). The New Arthurian Encyclopedia. Garland. p. 379. ISBN9781136606335.
Paris 1888, p. 222, vol.xxx. Friedwagner cites Paris, p. 222, where Paris seems to say that Raoul was long dead when Huon de Méry wrote in 1226. There is also Paris's comment on p. 237 that the author of Durmart must have laid eyes on the works of Raoul de Houdenc, combined with Paris's dating of Durmart (Paris, pp. 141–159) Paris, Gaston (1888). "Méraugis de Portlesguez". Histoire littéraire de la France. Vol. xxx. Imprimerie nationale. pp. 220–237.