APA (7th ed.) Citation

Beckman, P. R. (1984). World politics in the twentieth century. Prentice-Hall.

Chicago Style (17th ed.) Citation

Beckman, Peter R. World Politics in the Twentieth Century. Englewood Cliffs, N.J: Prentice-Hall, 1984.

MLA (9th ed.) Citation

Beckman, Peter R. World Politics in the Twentieth Century. Prentice-Hall, 1984.