APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Tull, G. K., and P. M. Bulwer. Britain and the World in the Twentieth Century / by G.K. Tull and P.M. Bulwer. Blandford, 1966.

MLA (9th ed.) Citation

Tull, G. K., and P. M. Bulwer. Britain and the World in the Twentieth Century / by G.K. Tull and P.M. Bulwer. Blandford, 1966.

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