A collection of written works primarily focused on the principles and regulations established in a community by some authority and applicable to its people, whether in the form of legislation or of custom and policies recognized and enforced by judicial decision. This category also includes folk tales, which are traditional stories passed down through generations, typically involving moral lessons and societal norms. Additionally, it encompasses science fiction books that explore imaginative and futuristic concepts such as advanced science and technology, space exploration, time travel, parallel universes, and extraterrestrial life.