APA (7th ed.) Citation

Henig, R. B. (1989). The origins of the First World War. Routledge.

Chicago Style (17th ed.) Citation

Henig, Ruth B. The Origins of the First World War. London [etc.]: Routledge, 1989.

MLA (9th ed.) Citation

Henig, Ruth B. The Origins of the First World War. Routledge, 1989.

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