Guinea Piglopaedia: a Complete Guide to Guinea Pigs
Guinea Piglopaedia is far more comprehensive than the RSPCA guide, and is very useful as a reference book, as well as being fun to read if you like these engaging creatures. There is plenty to interest experienced keepers, with a nice mix of the interesting and the practical, for example, there is a lot of helpful advice on preventing and tackling health problems. Both the authors, and Peter Gurney (see below) clearly know their subject, and both are excellent guides to guinea pigs. Guinea Piglopaedia is probably of more interest to experienced owners, and certainly deserves to become a classic.