APA (7th ed.) Citation

Kelly, N., & Whittock, M. (1995). The twentieth century world (Fully updated and rev. ed.). Heinemann.

Chicago Style (17th ed.) Citation

Kelly, Nigel, and Martyn Whittock. The Twentieth Century World. Fully updated and rev. ed. Oxford [u.a.]: Heinemann, 1995.

MLA (9th ed.) Citation

Kelly, Nigel, and Martyn Whittock. The Twentieth Century World. Fully updated and rev. ed. Heinemann, 1995.