Best book (besides rule book) for learning rules?

[Johnny Cakes]

I can't imagine why I didn't think of attempting to become an official before now. I know it will be tough but I think it will be fun and rewarding.

I have signed up with my local officiating sanctioning body and their classes for new refs will begin next year. I'm really looking forward to that.

Besides reading the official rulebook, are there any texts, videos, or other reference materials which would be helpful? Of course, reading this forum has been an education in and of itself!

Thanks!