'Book' in the Bible

It came out that it was recorded in the book how Mordecai had given word of the designs of Bigthana and Teresh, two of the king's servants, keepers of the door, by whom an attack on the king had been designed.

The order given by Esther gave the force of law to the rules about the Purim; and it was recorded in the book.

And all his acts of power and his great strength and the full story of the high place which the king gave Mordecai, are they not recorded in the book of the history of the kings of Media and Persia?