Canonical structural spine
The work's own structure
Reviewed edition: Augustinus Hipponensis, In Joannis evangelium tractatus CXXIV. J. P. Migne, Patrologia Latina 35. Parisiis, 1841. Corpus Corporum, Ph. Roelli, 2019. Division axes: tractate → section. 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.