APA (7th ed.) Citation

Twain, M., & Doyno, V. (1983). Mark Twain, selected writings of an American skeptic. Prometheus Books.

Chicago Style (17th ed.) Citation

Twain, Mark, and Victor Doyno. Mark Twain, Selected Writings of an American Skeptic. Buffalo, N.Y.: Prometheus Books, 1983.

MLA (9th ed.) Citation

Twain, Mark, and Victor Doyno. Mark Twain, Selected Writings of an American Skeptic. Prometheus Books, 1983.