My comment on the book is.
It is a good book to start with for someone who is interested in the types. But not for someone who wants to dig deeper in the psychology. For the latter, they should read Psychological Types by Carl Jung himself. Myers is credited because it was her effort to pairs judging function with perceptive functions resulting in 16 types. This what jung didn't do. Jung only said that there are no pure types in the actuality. It means that there are no pure Ni types, pure Te types. Myers develop it more.