The Books of Jasher

"Behold it is written in the Book of Jasher."--II Samuel, i. 18 ---
"Is not this written in the Book of Jasher?"--Joshua, x. 13 ---

History has given us two separate and very different books by the same title. One of these may be the book mentioned in the Holy Bible. If so, it would reveal history and information which would augment and supplement our knowledge of the events from creation to the conquering of the Promised Land.
The Books of Jasher: The Book of Jasher, The J. H. Parry Text

And

The Book of Jasher, also called Pseudo-Jasher, The Flaccus Albinus Alcuinus Text