Despite all the information on the internet most author will tell you unless the subject is very common the information on it is very limited and the only place to find what you are looking for is the library. The internet is the basic of a subject not an in-depth research of a subject.
Neil Gaiman say too often adults determine what children could read based upon their own preference which may or may not be your child’s taste. Some say it’s up to the parent to select their children reading material. I believe it depends upon the age and maturity of the child. I don’t believe in presenting an eight or nine year old the same book you presented them at age three or four.