Referenced in:

• mss: 186 - Cambridge, Trinity College, R. 15. 32 (945) 140-1, 150
• st: 186 - Cambridge, Trinity College, R. 15. 32 (945) 140-50
• st: 398 - London, British Library, Cotton Vitellius A. xii, fols. 4-77 140-1 [Abbo of Fleury]
• mss: 423 - London, British Library, Harley 647 142-3
• st: 428.4 - London, British Library, Harley 2506 141, 143
• st: 483 - London, British Library, Royal 13. A. xi 140-50 [Abbo, De figuratione signorum, De differentia circuli et sphaerae]