Summa Theologiae: The Annunciation

Third Part, Question 30, Articles 1-4;

Article 1: Whether it was necessary to announce to the Blessed Virgin that which was to be done in her;

Article 2: Whether the annunciation should have been made by an angel to the Blessed Virgin;

Article 3: Whether the angel of annunciation should have appeared to the Virgin in a bodily vision;

Article 4: Whether the Annunciation took place in becoming order