John Gill Commentary 2 Kings 14:18

"Now the rest of the acts of Amaziah, are they not written in the book of the chronicles of the kings of Judah?" — 2 Kings 14:18 (ASV)

And the rest of the acts of Amaziah, are they not written in the book of the chronicles of the kings of Judah ? ] Not in the canonical book of Chronicles; though there are some things of him recorded there, which are not here; but in the annals of each reign, written by the king's historian appointed for that purpose.