Rand, Edward Kennard «Osbert of Clare, the Sarum Breviary, and the Middle-English Saint Anne in Rime Royal». Speculum. Mediaeval Academy of America, 7, 1932, pàg. 106. DOI: 10.2307/2848329.
Dugmore, C. W. «On the Promotion of English University Clerks during the Later Middle Ages». Journal of Ecclesiastical History. Cambridge University Press, 1, 1950, pàg. 174. DOI: 10.1017/S002204690007233X.
Salvador Miranda Elecció de 1241 i K. Eubel, Hierarchia Catholica, vol. I, p. 6.
Ryccardus de S. Germano, Chronica, in G. Pertz (ed.), Monumenta Germaniae Historica Volume 19, 378. A. Paravicini Bagliani, Cardinali di curia e "familiae" cardinalizie I (Padova: Antenore 1972), p. 13. Cf. S. Miranda: Cardinal Tommaso da Capua (note 2)