APA (7. basım) Alıntı

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

Chicago Style (17. basım) Atıf

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

MLA (9th ed.) Atıf

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