APA (7th ed.) Citation

Tull, G. K., & Bulwer, P. M. (1966). Britain and the world in the twentieth century (1. publ.). Blandford.

Chicago Style (17th ed.) Citation

Tull, G. K., and P. McG Bulwer. Britain and the World in the Twentieth Century. 1. publ. London: Blandford, 1966.

MLA (9th ed.) Citation

Tull, G. K., and P. McG Bulwer. Britain and the World in the Twentieth Century. 1. publ. Blandford, 1966.