Kaplan, Justin. Mr. Clemens and Mark Twain: A Biography. New York: Simon & Schuster, 1966.
Powers, Ron. Mark Twain: A Life. New York: Free Press, 2005.
Ward, Geoffrey C., Dayton Duncan, and Ken Burns. Mark Twain: An Illustrated Biography. New York: Alfred A. Knopf, 2001.
If you liked The Adventures of Tom Sawyer, you might enjoy:
John Knowles's A Separate Peace, 1959
Harper Lee's To Kill a Mockingbird, 1960
Olive Anne Burns's Cold Sassy Tree, 1981
Tony Earley's Jim the Boy, 2000
Mark Twain: A Film Directed by Ken Burns The website that accompanies the PBS film Mark Twain, a documentary directed by Ken Burns, includes classroom activities, selected writings, a chronology of Twain's life, and links to related websites.
The Mark Twain House & Museum The mission of The Mark Twain House & Museum is to foster an appreciation of the legacy of Mark Twain as one of our nation's defining cultural figures and to demonstrate the continuing relevance of his work, life, and times.
The Mark Twain Project A collaboration between the Mark Twain Papers and Project of The Bancroft Library, the California Digital Library, and the University of California Press, this website contains reliable texts, accurate and exhaustive notes, and the most recently discovered letters and documents. Its ultimate purpose is to produce fully annotated, digital editions of everything Mark Twain wrote.