A while ago there were some posts about cats that spread sand all over when they visited the box. I said I had a good book on Toilet Training. Well, it took me quite a while to dig it up but I finally found it.
It's called "How to Toilet Train Your Cat - 21 Days to a Litter-Free Home" by Paul Kunkel.
Why I liked this book (lordy, now I sound like a third-grader writing a book report.)
1st - it worked perfectly for one of our cats.
2nd - it has a lot of other useful information about cats including how to talk to them (no info on how to make them listen, though).
3rd - it has day-by-day descriptions of two different methods to toilet train a cat.
I have no idea if it's still in print, but I'm sure an internet search would turn it up.