APA (7th ed.) Citation

Twain, M., & Howells, W. D. (1967). Selected Mark Twain - Howells letters: 1872-1910. Belknap Press.

Chicago Style (17th ed.) Citation

Twain, Mark, and William Dean Howells. Selected Mark Twain - Howells Letters: 1872-1910. Cambridge Mass: Belknap Press, 1967.

MLA (9th ed.) Citation

Twain, Mark, and William Dean Howells. Selected Mark Twain - Howells Letters: 1872-1910. Belknap Press, 1967.

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