APA (7th ed.) Citation

Mangoldt, H. v., Rittberger, V., & Knipping, F. (1997). The United Nations system and its predecessors. Oxford University Press.

Chicago Style (17th ed.) Citation

Mangoldt, Hans von, Volker Rittberger, and Franz Knipping. The United Nations System and Its Predecessors. Oxford ; New York: Oxford University Press, 1997.

MLA (9th ed.) Citation

Mangoldt, Hans von, et al. The United Nations System and Its Predecessors. Oxford University Press, 1997.