The originals of these books should be under Public domain license. The Gutenberg project makes many books that are public domain available online as e-books. Be careful, the copyright expiration under Public domain may vary by country and derivative works may be protected by copyright law.
- Alice’s Adventures in Wonderland by Lewis Carroll
- The Adventures of Tom Sawyer by Mark Twain
- The Art of War by Sun Tzu
- The Adventures of Sherlock Holmes by Doyle, Sir Arthur Conan
- Moby Dick, or The Whale by Herman Melville
- Adventures of Huckleberry Finn by Mark Twain
- Sense and Sensibility by Jane Austen
The Flesch–Kincaid readability tests are tests that show how difficult it is to understand the English text. A lower school level indicates that the text is easier to read.