↑Ministerio de Cultura de España, Iglesia-catedral de San Pedro, (R.I.)-51-0000627- 00000, 03-06-1931.
Bartal, Ruth (1987). "The Survival of Early Christian Symbols in 12th Century Spain". Principe de Viana (48): 299–315.
Moralejo Alvarez, Serafín (1979). "La sculpture romane de la cathédrale de Jaca. État des questions". Les Cahiers de Saint-Michel de Cuxa (10): 79–106.
Adolph-Goldschmidt-Zentrum zur Erforschung der romanischen Skulptur. "San Pedro de Jaca" (in German). Archived from the original on 24 September 2015. Retrieved 28 November 2010.
The Art of medieval Spain, A.D. 500-1200, an exhibition catalog from The Metropolitan Museum of Art Libraries (fully available online as PDF), which contains material on Jaca Cathedral (no. 88)