Sixty-six books. How many writers?
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Modern scholars believe that the 66 books of the Bible were written by at least 39 authors over a period of 1,500 years.
Here are links to information on the website which will help you to answer your question:
The Miracle of the Bible: www.thisisyourbible.com/library/show/149
The Divine Origin of the Bible: www.thisisyourbible.com/library/show/160
I hope you have found this helpful.