APA (7th ed.) Citation

Twain, M., & Neider, C. (1982). Selected letters of Mark Twain. Harper & Row.

Chicago Style (17th ed.) Citation

Twain, Mark, and Charles Neider. Selected Letters of Mark Twain. New York: Harper & Row, 1982.

MLA (9th ed.) Citation

Twain, Mark, and Charles Neider. Selected Letters of Mark Twain. Harper & Row, 1982.