John Gill's  Exposition of the Bible 

2 Chronicles 27:7

Now the rest of the acts of Jotham, and all his wars, and his ways, lo, they are written in the book of the kings of Israel and Judah.

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.