I can’t offer any book ideas, but I do know they they like their routine. They love their rituals. First I get my scratches, then I get my food, then I…(you get the idea). Get a routine down and you’re half way home. Also, at first place litter boxes in several areas around the house. Kitty won’t remember exactly where the litter box is at the beginning, and multiple boxes helps eliminate mistakes. After a couple weeks, move the box a few feet every day until you have it close enough to another one that you can eliminate it. If it’s a big house I’d plan to have one box on each floor.