E. Randolph Daniel, The Franciscan Concept of Mission in the High Middle Ages, University of Kentucky Press, (1975).
Benjamin Kedar, Crusade and Mission: European Approaches Towards the Muslims, Princeton University Press, (1984).
Christopher MacEvitt, The Martyrdom of the Franciscans: Islam the Papacy, and an Order in Conflict, University of Pennsylvania Press, (2020).
James D. Ryan, “Conversion or the Crown of Marytrdom: Conflicting Goals in for Fourteenth Century Missionaries in Central Asia?” In Medieval Cultures in Contact, edited by Richard Gyug, Fordham University Press, (2003): 19-38.
Music: "Evening Melodrama" by Kevin Macleod (www.incompetech.com)