The other books that are referred to in the Bible are actually historical reference books. They are kind of like footnotes that we have on documents today.
They are saying: "For more details, refer to this."
Most of these writings referred to in the Bible are historical (Joshua 10:13, 2 Samuel 1:18, 1 Kings 11:41, 1 Chronicles 29:29, 2 Chronicles 9:29, 2 Chronicles 13:22, etc.). But they are not included in the Bible, because the Bible only includes the most important acts and points.
The Apostle John makes this clear when he said:
"And there are also many other things which Jesus did, which if they were written in detail, I suppose that even the world itself would not contain the books that would be written." (John 21:25)
So the Bible is already many hundreds of pages long. God has decided that everyone should read the Bible. The other works (especially these historical acts by kings and prophets) goes into detail some of the things that happened, but is not required reading. There is already a lot of historical acts included in the Bible (for example, 1 and 2 Kings, 1 and 2 Chronicles, Judges, the books by the prophets, etc). So all these other writings are mentioned as kind of like footnotes for anyone who is interested at the time, but these writings were most likely destroyed during the Babylonian Captivity.
Now the works that name themselves after those "lost" books are most likely forgeries.
For more info, see https://www.gotquestions.org/book-of-Jasher.html
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In the New Testament, writing under God's guidance, the apostle Paul included a quotation from a Cretan poet named Epimenides (Titus 1:12). He also quoted from poets Epimenides and Aratus in his speech at Athens (Acts 17:28).
Clearly, merely quoting a line from outside the Bible does not make that extrabiblical text sacred. Nor can the extrabiblical text ever be regarded with the same authority as the Bible.
God simply used those quotes to make a point.
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The most important things are in the Bible, which is God-breathed and authoritative. From the Bible alone, which God preserves, there is much to learn.