Ruys, T. (2010). "Armed attack" and Article 51 of the UN Charter: Customary law and practice. Cambridge University Press.

Ruys, Tom. "Armed Attack" and Article 51 of the UN Charter: Customary Law and Practice. Cambridge ; New York: Cambridge University Press, 2010.

Ruys, Tom. "Armed Attack" and Article 51 of the UN Charter: Customary Law and Practice. Cambridge University Press, 2010.