Edmund Martene; Ursin Durand (1717). Thesaurus novus anecdotorum (in Latin). Vol. Tomus secundus. Paris: Sumptibus Florentini Delaulne. pp. 587, 604.
Edmond Martène (1729). Veterum scriptorum et monumentorum historicorum, dogmaticorum, moralium, amplissima collectio (in Latin). Vol. Tomus IV. Paris: apud Montalant. pp. 261, 313. This appointment was made by the Pope in consultation with the Cardinals; Clement IV died on 29 November 1268, and no new appointments could be made during the Sede Vacante, which lasted for two years and nine months.
Pierre Frizon, Gallia purpurata (Paris: Simon Le Moine 1638), p. 207. Alfonso Chacón; Augustin Oldoin (1677). Vitae et res gestae pontificum romanorum: et S.R.E. cardinalium (in Latin). Vol. Tomus secundus. Roma: P. et A. De Rubeis. p. 407. Crozes, p. 70.