Cita APA (7a ed.)

Christie, A. (1978). An Autobiography (2.). [s.n.].

Cita Chicago Style (17a ed.)

Christie, Agatha. An Autobiography. 2. Wallingford, Inglaterra: [s.n.], 1978.

Cita MLA (9a ed.)

Christie, Agatha. An Autobiography. 2. [s.n.], 1978.