Cita APA (7a ed.)

Butler, W. E. (1989). The Non-use of force in international law. Martinus Nijhoff.

Cita Chicago Style (17a ed.)

Butler, William Elliott. The Non-use of Force in International Law. Dordrecht [etc.]: Martinus Nijhoff, 1989.

Cita MLA (9a ed.)

Butler, William Elliott. The Non-use of Force in International Law. Martinus Nijhoff, 1989.