APA (7th ed.) Citation

Grenville, J. A. S. (1994). The Collins history of the world in the twentieth century. HarperCollins.

Chicago Style (17th ed.) Citation

Grenville, John A. S. The Collins History of the World in the Twentieth Century. London: HarperCollins, 1994.

MLA (9th ed.) Citation

Grenville, John A. S. The Collins History of the World in the Twentieth Century. HarperCollins, 1994.