what other book, in king james's bible, is credited to john?

Answer 1

Under inspiration of Jehovah God, the apostle John wrote 5 books found in the Christian Greek Scriptures. These are:
* John
* 1 John
* 2 John
* 3 John
* Revelation

Answer 2

He wrote the gospel of John.
He wrote 1st, 2nd and 3rd John.
He wrote Revelation (Apocalypse).

Answer 3

do you mean john wrote in the new testement it will be book of john and luke and romans