One or more of the preceding sentences incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). "Ferrier, Arnaud du". Encyclopædia Britannica. Vol. 10 (11th ed.). Cambridge University Press. p. 287. This cites E. Frómy, Un Ambassadeur liberal sous Charles IX et Henri III, Arnaud du Ferrièr (Paris, 1880).