I too agree, hamsterlopaedia is a book held in high regards by breeders and experienced keepers, but no book could ever match the amount of information you can get online! The communities online are made up of highly knowledgeable breeders as well as just general keepers and thus there's tons of opinions to consider. A book unfortunately has the opinion of just one or perhaps two keepers rather than a plethora like the internet would have. Plus, information online is constantly evolving and being changed when it needs to be unlike books. All in all, I'd check out hamsterlopaedia as it can be purchased with nothing more than pocket money