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The Dante Encyclopedia [online and in print]
Dante: A Very Short Introduction [online and in print] by 
The Cambridge Companion to Dante [print only]
A Dictionary of Proper Names and Notable Matters in the Works of Dante [print only] by 
The Divine Comedy: Tracing God's Art [print only] by 
The Cambridge History of Italian Literature [online]
Storia della letteratura italiana [print only], 14 vols. by 
Italian Literature: A Very Short Introduction [online] by 
Encyclopedia of the Middle Ages [online and in print]
The Oxford Dictionary of the Middle Ages [online]
New Catholic Encyclopedia [online and in print]