APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Howarth, Tony. Twentieth Century History : The World Since 1900 / (by) Tony Howarth: The World Since 1900. London: Longman, 1979.

MLA (9th ed.) Citation

Howarth, Tony. Twentieth Century History : The World Since 1900 / (by) Tony Howarth: The World Since 1900. Longman, 1979.

Warning: These citations may not always be 100% accurate.