John Gill Commentary 2 Chronicles 27:7

"Now the rest of the acts of Jotham, and all his wars, and his ways, behold, they are written in the book of the kings of Israel and Judah." — 2 Chronicles 27:7 (ASV)

Now the rest of the acts of Jotham, and all his wars
Not only with the Ammonites, but with the Syrians, and ten tribes, see (2 Kings 15:37)

and his ways, lo, they are written in the books of the kings of Israel
and Judah ;
not in the canonical books of Kings, but in the Chronicles of the kings of both nations, see (2 Kings 15:36) .