Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (8a ed.)

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