As for the rest of the acts of Amon, along with his accomplishments, are they not written in the Book of the Chronicles of the Kings of Judah?
Here is a short account of the short and inglorious reign of Amon, the son of Manasseh. Whether Manasseh, in his blind and brutish zeal for his idols, had sacrificed his other sons - or whether, having been dedicated to his idols, they were refused by the people - so it was that his successor was a son not born till he was forty-five years old.
Commenting on 2 Kings 21:19-26
Now the rest of the acts of Amon which he did, are they not written in the book of the chronicles of the kings of Judah? See Gill on Kg2 21:17. 2 Kings 21:26
2Ki 21:23-25 His servants conspired against him and slew him in his palace; whereupon the people of the land, i.e., the population of Judah (הארץ עם = יהוּדה עם, 2Ch 26:1), put the conspirators to death and made Josiah the son of Amon king, when he was only eight years old.
Commenting on 2 Kings 21:23-25