If its something important to you or valuable to the market, seek a professional. It will take time and cost like the dickens but anything you do at home will be as much damage as repair.
That being said, I have a couple basically worthless old (1740s) books I keep to read around camp at historic events. For them I use white glue for spine repairs and then sometimes reinforce the repair by white gluing a strip of pillow ticking over the whole spine and partly into the front and rear boards.