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- Arnett, Ethel S. O. Henry from Polecat Creek. Greensboro, N.C.: Piedmont Press, 1962.
- Clarkson, Paul S. A Bibliography of William Sydney Porter. Caldwell, Idaho: Caxton Printers, 1938.
- Current-Garcia, Eugene. O. Henry: A Study of the Short Fiction. New York: Twayne, 1993.
- —. O. Henry (William Sydney Porter). New York: Twayne, 1965.
- Harris, Richard C. William Sydney Porter (O. Henry): A Reference Guide. Boston: G. K. Hall, 1980.
- Kramer, Dale. The Heart of O. Henry. New York: Rinehart, 1954.
- Langford, Gerald. Alias O. Henry: A Biography. New York, Macmillan, 1957.
- Long, Eugene H. O. Henry, the Man and His Work. Philadelphia: U. of Pennsylvania Press, 1949.
- Nolan, Jeanette. O. Henry: The Story of William Sydney Porter. New York: J. Messner, 1943.
- O’Connor, Richard. O. Henry: The Legendary Life of William S. Porter. Garden City, N.Y.: Doubleday, 1970.
- O’Quinn, Trueman E. Time to Write: How William Sidney Porter Became O. Henry. Austin, Texas: Eakin Press, 1986.
- Pike, Cathleen. O. Henry in North Carolina. Chapel Hill: University of North Carolina Library, 1957.
- Stuart, David. O. Henry: A Biography. Chelsea, Michigan: Scarborough House, 1990.
- Williams, William W. The Quiet Lodger of Irving Place. New York: E. P. Dutton, 1936.
- Wilson, Lollie C. Hard to Forget: The Young O. Henry. Los Angeles: Lymanhouse, 1939.
