1. Derek J. Price, ed., The Equatorie of the Planetis: Edited from Peterhouse MS. 75.I, with a linguistic analysis by R. M. Wilson (Cambridge, Eng., 1955).
2. Price, ed., Equatorie, 159, 161.
3. Price, ed., Equatorie, 161.
4. Price, ed., Equatorie, 156-59.
5. J. D. North, Chaucer's Universe (Oxford, 1988).