I'll wing out the ones I know can work, apply common sense obviously.

Freezing books is very dependent on the problem, it's what I used when I dropped book in the tub. You have to have a freezer with an automatic defrost to really do this though. So if there's ice all over the inside of your fridge, don't bother, it simply inhibits mold growth then. If you have a defrost you will dehydrate the book, you're basically inducing frostburn by leaving the book exposed to the freezer open air (no plastic bag) and over a decent duration it will leach out the water.

Normal freezing inhibits mold growth but doesn't kill the spores, but freeze drying will, it takes weeks though. You can speed the process, or utilize it for a non-defrosting freezer, by packing it in a plastic bag with desiccant.

You can also microwave it, in several 15 second blasts, or stick it in the oven at 250 F for 1 hour. You can also use a UV wand, there like $20.

Easiest way though, take the book and stick it in a paper bag with some baking soda, give it an occasional shake, once or twice a day, and remove it in a week or two and dust off the baking soda.Freezing it then sticking it the bag probably isn't a bad idea either.