Παραπομπή σε μορφή APA (7η εκδ.)

Bull, M. G. (1993). Knightly piety and the lay response to the First Crusade: The Limousin and Gascony c.970-c.1130. Clarendon.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Bull, Marcus Graham. Knightly Piety and the Lay Response to the First Crusade: The Limousin and Gascony C.970-c.1130. Oxford: Clarendon, 1993.

Παραπομπή σε μορφή MLA (9th εκδ.)

Bull, Marcus Graham. Knightly Piety and the Lay Response to the First Crusade: The Limousin and Gascony C.970-c.1130. Clarendon, 1993.