I've not found any books that cover bonsai pots. Most are all concerned with making cups, bowls, vases etc. Those can be very helpful with techniques and many are applicable to bonsai pot application. As someone mentioned earlier in this thread, Greg Ceramics has some great Youtube vids. Totally instructive and inspiring. Aaron Stratten has some too.
I started a Pinterest page for myself that is all ideas for bonsai pots. Some are very traditional Japanese and others are very modern. It has shapes and glazes that I like or find inspiring. Here's a link:
https://www.pinterest.com/studiovoltaire/pots-and-pottery/
The main tips I can give are if you are doing slab built pots:
1. make a paper pattern first...before class. Start with something moderate in size, a 8-10" long pot. Oval or rectangle. Something simple, then move on from there. The main thing is make your patterns first. Don't get to class and go, "what am I going to make today?" You waste precious class time that way. Plan in advance with the type of pot you want and make a pattern. Newprint is fine, but a slightly heavier paper is better (brown craft paper). DON'T use inkjet paper from home. It soaks up the moisture and can stick to your clay (I learned the hard way and spent hours gently scraping paper off of slabs and pot bottoms.). Take printouts of the style pot you are wanting to create. The instructor may be able to help guide you with tips. Bottom line: plan ahead and have a goal.
2. Roll your slabs out first and leave them to sit for a while before you start building. It is way easier to build from slabs or thrown rings if you let them sit and firm up. I always start class by rolling out 2-3 big slabs (I do mine 1/4 or 3/8ths thick) and let them sit to use later in class. Part of it is drying out (put a fan on them if you can), but I think that clay sort of gets firmer if you let it rest for a while.
3. Feet. If you get the walls up on a pot, wait to let it get to leather hard stage before you try to put the feet on. That usually happens at the next session of class. Wrap the pot up in plastic and add the feet several days later. I often will support the middle of a larger pot with a center foot too. Not very "Japanese" but no one sees it once a tree is in the pot and it can save a pot from slumping in the kiln. I even will do temporary center feet on smaller pots for support while drying.
So those are my pearls of wisdom. Have fun!