Fletcher, G. P. Defending humanity: When force is justified and why. Oxford University Press.
Chicago-referens (17:e uppl.)Fletcher, George P. Defending Humanity: When Force Is Justified and Why. Oxford: Oxford University Press.
MLA-referens (9:e uppl.)Fletcher, George P. Defending Humanity: When Force Is Justified and Why. Oxford University Press.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.