APA (7th ed.) Citation

Twain, M., & Paine, A. B. (1920). Letters of Mark Twain. Chatto & Windus.

Chicago Style (17th ed.) Citation

Twain, Mark, and Albert Bigelowe Paine. Letters of Mark Twain. Lond.: Chatto & Windus, 1920.

MLA (8th ed.) Citation

Twain, Mark, and Albert Bigelowe Paine. Letters of Mark Twain. Chatto & Windus, 1920.

Warning: These citations may not always be 100% accurate.