The literature about the individual popes, and the collections of documents published, registers, letters, etc., are so numerous, that I cannot include even a selection here. The reader is referred to Chevalier’s Répertoire des sources historiques du Moyen Âge, where, under each pope, will be found the most complete and most recent bibliographical references.
Genoese (including Pera Colony): Belgrano; Jorga; Miklositch; Müller; Noradounghian; Olivieri; Predelli; Testa.
Other Italian Cities: Jorga; Müller.
French: Boislisle; Bongars; Bouchon; Charrière; Delaville Leroulx; Dorez; Garnier; Jorga; Kunstmann; Leuridan; Lot; Molinier; Moranvillé; Potansque; Raimboult; Roncière; Tarbé.
English: Rymer.
Contemporary Chronicles.
Byzantine: Cantacuzenos; Nicephoros Gregoras; Pachymeres; Panaretos (for Trebizond).
Catalan: Moncada; Muntaner. (See also Frenzel.)
French: Enguerran de Monstrelet; Eustache des Champs; Froissart; Gilles; Marche; Nangis; Ursins; Wavrin; Anon.: Cronicorum Karoli Sexti; Chronique du duc Loys de Bourbon; Chronique du religieux de Saint-Denis; Chronique des quatre premiers Valois; Livre des faicts de Jean le Maingre, dit Bouciquaut; Relation de la Croisade de Nicopolis (serviteur de Gui de Blois). (See also under the Editors: Bellaguet; Géraud; Godefroy; Kervyn de Lettenhove; Lacabane; Lemaitre.)
Hebrew: Joseph ben Joshua.