Andrews, Frances ; Methuen, Charlotte and Spicer, Andrew, with Nelson, Janet L. (Jinty) on Carolingian doubt.

Baldwin, James and (ill.) Hurd, Peter

Barrington, Michael

Bullough, Donald

Codex Calixtinus (ed. Poole, Kevin)

Codex Calixtinus and Martínez-Morás, Santiago López

Codex Calixtinus and Williams, Stephen J

Codex Calixtinus, Book IV, Pseudo-Turpin

Codex Calixtinus, Book IV, Pseudo-Turpin (ed. Castets, Ferdinand)

Codex Calixtinus, Book IV, Pseudo-Turpin (ed. Herbers, Klaus et al., trans. into Spanish by Moralejo, A. et al.)