Bierce, Ambrose. The Letters of Ambrose Bierce, edited by Bertha Clark Pope, San Francisco: The Book Club of California, 1922, reprinted by Gordian Press, 1967.

A collection of some of Bierce's letters.

—. A Sole Survivor, Bits of Autobiography, edited by S. T. Joshi and David E. Schultz, Knoxville, TN: University of Tennessee Press, 1998.

A collection of Bierce's own writings, which reflect on his life, his adventures, and his thoughts.

Grenader, M. E. Ambrose Bierce, New York: Twayne Publishers, Inc., 1971.

A critical overview of Bierce's major texts.

Lovecraft, Howard Phillips. Supernatural Horror in Literature, New York: Dover Publications, 1973.

A thorough discussion of the supernatural horror genre and its most important writers as well as schools of writing.

Morris, Roy, Jr. Ambrose Bierce, Alone in Bad Company, New York: Crown Publishers, Inc., 1995.

A biography of Bierce.