Percy, S. (2007). Mercenaries: The History of a Norm in International Relations. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Percy, S. Mercenaries: The History of a Norm in International Relations. Oxford University Press, 2007.
Lua MLA (9ú heag.)Percy, S. Mercenaries: The History of a Norm in International Relations. Oxford University Press, 2007.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.