Nikolaus Theoderici de Driel – oder: Wohin eine Supplik führen kann - Schmugge, Ludwig (Popes, Bishops, Religious, and Scholars: Studies in Medieval History Presented to Patrick N. R. Zutshi for his Seventieth Birthday, 2024)

The Interdict in the Thirteenth Century. A Question of Collective Guilt - Clarke, Peter D. (Oxford University Press, 2007)