APA (7th ed.) Citation

Bruun, G. (1952). The world in the twentieth century (Rev. ed.). Heath.

Chicago Style (17th ed.) Citation

Bruun, Geoffrey. The World in the Twentieth Century. Rev. ed. Boston: Heath, 1952.

MLA (9th ed.) Citation

Bruun, Geoffrey. The World in the Twentieth Century. Rev. ed. Heath, 1952.