My source, other than Triumph? Quite a number of good, Catholic sources. And Rome did settle that one.
Augustine and Jerome did not quarrel over the canon of the Old Testament, but over whether it was fitting to translate the Latin bible from the Hebrew scriptures, rather than the Greek. The 3rd Council of Carthage had settled the matter of the canon long before then, which is why Jerome was so alarmed at the accusation that he desired to assert the Hebrew canon. You can find Augustine’s letters to Jerome over the translation here: http://www.newadvent.org/fathers/1102071.htm and here. This lists all letters received by or sent from Augustine, including to and from Jerome: http://www.newadvent.org/fathers/1102.htm
How strange it would be for Augustine and Jerome to quibble over wordings in such letters, and not reveal the much greater issue of canonicity?
I should note that I do not doubt the validity of your sources. The 1917 Catholic Encyclopedia, a lay publication, credulously states the conventional wisdom established by Martin Luther’s lies, ignorant of Jerome’s own denials of Luther’s interpretation of his introduction to the deuterocanonicals.