Cita APA (7a ed.)

Clare, J. D. (1995). The twentieth century (1. publ.). Nelson.

Cita Chicago Style (17a ed.)

Clare, John D. The Twentieth Century. 1. publ. Walton-on-Thames, Surrey: Nelson, 1995.

Cita MLA (9a ed.)

Clare, John D. The Twentieth Century. 1. publ. Nelson, 1995.