[Vectis Hamstery]

Another vote for Hamsterlopaedia here! I have a collection of over 30 hamster books (oops!) and that's the only one that doesn't have incorrect information in it, especially about dwarves. It may not be full of pretty pictures but it's thorough, including hamster anatomy, physiology, genetics, health as well as care and breeding. True it doesn't have all the new standards and colours in it, but it is a few years old now.