Canonical structural spine
The work's own structure
Reviewed edition: Leonine text emended from the Turin 1961 printing as identified by Corpus Thomisticum. Division axes: book → chapter. Structural nodes alone do not assert commentary citations.
Record-local commentary evidence
Commentary citations: work locus ↔ Dante locus
These citations occur in later commentary. They do not, by themselves, mean Dante cited this work.