Lower 2014, p. 605. Lower, Michael (2014). "The Papacy and Christian Mercenaries of Thirteenth-Century North Africa". Speculum. 89 (3 JULY). The University of Chicago Press: 601–631. doi:10.1017/S0038713414000761. S2CID154773840.
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Lower 2014, p. 605. Lower, Michael (2014). "The Papacy and Christian Mercenaries of Thirteenth-Century North Africa". Speculum. 89 (3 JULY). The University of Chicago Press: 601–631. doi:10.1017/S0038713414000761. S2CID154773840.