Sources & credits

Magisterial documents — encyclicals, conciliar constitutions, the Catechism — are taken from the official website of the Holy See, the only reference edition, with their apparatus of notes. Rights in these texts belong to the Libreria Editrice Vaticana; they are reproduced here for reading and study.

The French translation of the Summa, in the online edition of the Œuvres complètes de saint Thomas d'Aquin — the four parts and the Supplement.

The English edition of the Summa, from the Christian Classics Ethereal Library (Fathers of the English Dominican Province translation), aligned on the same addresses as the French.

The Latin text of Augustine's works (De civitate Dei, Confessiones…), from The Latin Library — the spine edition, on which the book/chapter/section addresses are keyed.

The English text, in the Nicene and Post-Nicene Fathers translation (Schaff) hosted by New Advent, aligned on the same addresses as the Latin.

The French translation, in the Œuvres complètes de saint Augustin (Raulx–Poujoulat edition) mirrored at livres-mystiques.com, aligned on the same addresses.

The Enchiridion Symbolorum (Denzinger): the Latin text keyed directly by DS number, and the English (Deferrari, Sources of Catholic Dogma) re-keyed to DS through the Latin edition's parallel numbering — hosted at patristica.net.

The French text, from the Denzinger-Hünermann edition (DS-numbered) mirrored at catho.org, aligned on the same DS addresses.

Etymology in the answer engine (“Study”) draws the Greek (NT) or Hebrew (OT) root of key words in the cited verses from STEPBible-Data (Tyndale House, Cambridge — CC BY 4.0): the Strong-tagged Greek NT (TAGNT) and Hebrew OT (TAHOT) with their brief lexicons (TBESG, TBESH).

Cross-reference data from OpenBible.info (CC-BY), derived from the Treasury of Scripture Knowledge. Covers the 66 books of the protestant canon.

Cross-references and pericope divisions from the Russian Synodal edition — an Orthodox voice, and the source that fills the deuterocanonical gap left by the Treasury. Verse numbering converted from Septuagint/Slavonic to the Hebrew numbering used here.