Cita APA (7a ed.)

Howarth, T. (1979). Twentieth century history: The world since 1900. Longman.

Cita Chicago Style (17a ed.)

Howarth, Tony. Twentieth Century History: The World Since 1900. London: Longman, 1979.

Cita MLA (9a ed.)

Howarth, Tony. Twentieth Century History: The World Since 1900. Longman, 1979.