Cita APA (7th ed.)

Twain, M. (1924). Mark Twain's Autobiography. Harper.

Cita Chicago (17th ed.)

Twain, Mark. Mark Twain's Autobiography. New York [u.a.]: Harper, 1924.

Cita MLA (8th ed.)

Twain, Mark. Mark Twain's Autobiography. Harper, 1924.