First off, kudos for doing some research!! Personally, I think you’re best off with any book by Debbie Ducommun, creater of the Rat Fan Club. A lot of rat books on the market are outdated or filled with misinformation, and Debbie’s so obsessed with rats that I trust her more than anyone else. She’s written two books which I think are absolute necessities for anyone who cares about their rats. They’re called “the Rat Health Care Booklet,” and “Rats: Complete Care Guide.” The booklet is only sold through the Rat Fan Club website. If you’re interested in training your rat, I’ve heard great things about “Training Your Pet Rat,” By Barbara Somerville. Both books are pretty inexpensive.