I have Hamsterlopedia too. I can also recommend this RSPCA one we got before getting our hamster (if only I had read it properly before getting the first cage lol). It's very good but it depends what kind of book/info you want. The RSPCA is a very good general one covering Hamsters generally and their welfare needs, diet, housing and so on. Hamsterlopedia is more detailed and scientific. Both good though.
Hamster Books
Linear Mode
