Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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