APA (7th ed.) Citation

Clemens, S. L. (1960). Clemens, Samuel L.; Howells, William D.; Smith, Henry Nash; Gibson, William M: Mark Twain-Howells Letters. Volume I. Harvard University Press. https://doi.org/10.4159/harvard.9780674368859

Chicago Style (17th ed.) Citation

Clemens, Samuel L. Clemens, Samuel L.; Howells, William D.; Smith, Henry Nash; Gibson, William M: Mark Twain-Howells Letters. Volume I. Cambridge, Mass: Harvard University Press, 1960. https://doi.org/10.4159/harvard.9780674368859.

MLA (9th ed.) Citation

Clemens, Samuel L. Clemens, Samuel L.; Howells, William D.; Smith, Henry Nash; Gibson, William M: Mark Twain-Howells Letters. Volume I. Harvard University Press, 1960. https://doi.org/10.4159/harvard.9780674368859.