...bibliography / works cited...

Ousby, Ian. The Wordsworth Companion to Literature in English.   
     (Hertfordshire, UK : Cambridge University Press, 1992).

Paine, Albert Bigelow. "A Biography of Samuel L. Clemens." from 
    Mark Twain's Letters (New York : Harper & Brothers, 1917),  
http://www.geocities.com/SoHo/Den/9554/bio1.htm

Twain, Mark.  The Adventures of Huckleberry Finn 
     (New York : Harper & Row, 1959). 

Twain, Mark. The Adventures of Tom Sawyer. from The Favorite  
     Works of Mark Twain. (New York : Garden City Publishing 
     Company, 1939).

Twain, Mark. Life on the Mississippi from The Favorite Works of 
     Mark Twain. (New York : Garden City 
     Publishing Company, 1939).