APA (7th ed.) Citation

Bruun, G., & Mamatey, V. S. (1962). The world in the twentieth century (4th ed.). Heath.

Chicago Style (17th ed.) Citation

Bruun, Geoffrey, and Victor S. Mamatey. The World in the Twentieth Century. 4th ed. Boston: Heath, 1962.

MLA (9th ed.) Citation

Bruun, Geoffrey, and Victor S. Mamatey. The World in the Twentieth Century. 4th ed. Heath, 1962.