Referenced in:

• mss: 252 - Edinburgh, National Library of Scotland, Advocates 18. 6. 12 39-40
• mss: 253 - Edinburgh, National Library of Scotland, Advocates 18. 7. 7 38, 50-1
• mss: 254 - Edinburgh, National Library of Scotland, Advocates 18. 7. 8 [palimpsest, upper script] 48-50