| CCCM | Corpus Christianorum, Continuatio Mediaevalis |
| CCM | Corpus consuetudinum monasticarum |
| CF | Cistercian Fathers series |
| CS | Cistercian Studies series |
| CSEL | Corpus scriptorum ecclesiasticorum laatinorum |
| Customs | From Dead of Night to End of Day: The Medieval Customs of Cluny = [Du cœur de la nuit à la fin du jour. Les coutumes clunisiennes au Moyen Âge]. Edited by Susan Boynton and Isabelle Cochelin. Turnhout: Brepols Publishers, 2005. |
| Ep(p | Epistola(e |
| Fontes | Fontes Franciscani. Edited by Enrico Menestò and Stefano Brufani. Assisi: Edizioni Porziuncola, 1997. |
| MGH | Monumenta Germaniae Historica |
| MGHSS | MGH Scriptores |
| PG | Patrologia Graeca, ed. J.-P. Migne |
| PL | Patrologia Latina, ed. J.-P. Migne |
| SBOp | Sancti Bernardi Opera. Edited by Jean Leclercq and H. M. Rochais. Rome: Editiones Cistercienses, 1957–77. |
| SCh | Sources chrétiennes |
| Schriften | Franziskus-Quellen. Die Schriften des heiligen Franziskus, Lebensbeschreibungen, Chroniken und Zeugnisse über ihn und seinen Orden. Edited by Dieter Berg and Leonhard Lehmann. Kevelaer: Butzon & Bercker, 2009. |