APA (7th ed.) Citation

Twain, M., & Day, A. G. (1967). Mark Twain's letters from Hawaii. Chatto & Windus.

Chicago Style (17th ed.) Citation

Twain, Mark, and A. Grove Day. Mark Twain's Letters from Hawaii. London: Chatto & Windus, 1967.

MLA (8th ed.) Citation

Twain, Mark, and A. Grove Day. Mark Twain's Letters from Hawaii. Chatto & Windus, 1967.