APA (7th ed.) Citation

Tull, G. K., & Bulwer, P. M. (1975). Britain and the world in the twentieth century (4th and revised ed.). Blandford.

Chicago Style (17th ed.) Citation

Tull, G. K., and P. McG Bulwer. Britain and the World in the Twentieth Century. 4th and revised ed. London: Blandford, 1975.

MLA (9th ed.) Citation

Tull, G. K., and P. McG Bulwer. Britain and the World in the Twentieth Century. 4th and revised ed. Blandford, 1975.