This classification system for Wikipedia books is based on Wikipedia's Outline of knowledge. If you want guidance categorizing a book or subcategory, please refer to that outline. All books from the Book: namespace (i.e community books) should be placed under at least one of these categories. Do not categorize books from the User: namespace (user books) in these.
Note. When adding a book category to its corresponding encyclopedia category, use the following pipe to sort it in the subcategories list.
This category has the following 10 subcategories, out of 10 total.