APA (7th ed.) Citation

Schoppa, R. K., & Oxford Scholarship Online. (2021). The twentieth century: A world history. Oxford University Press.

Chicago Style (17th ed.) Citation

Schoppa, R. Keith, and Oxford Scholarship Online. The Twentieth Century: A World History. New York, NY: Oxford University Press, 2021.

MLA (8th ed.) Citation

Schoppa, R. Keith, and Oxford Scholarship Online. The Twentieth Century: A World History. Oxford University Press, 2021.