Percy, Sarah Mercenaries: The History of a Norm in International Relations. Oxford, United Kingdom: Oxford University Press, 2007.
Percy, Sarah (2014). The unimplemented norm: anti-mercenary law and the problems of institutionalization. In Alexander Betts and Phil Orchard (Ed.), Implementation and world politics () Oxford, United Kingdom: Oxford University Press.
Percy, Sarah V. (2008). The Security Council and the use of private force. In Vaughan Lowe, Adam Roberts, Jennifer Welsh and Dominik Zaum (Ed.), The United Nations Security Council and war: the evolution of thought and practice since 1945 (pp. 624-642) Oxford, United Kingdom: Oxford University Press.
Percy, Sarah (2015) Foreign fighters aren’t a new problem, so heed history’s lessons. The Conversation, .
Percy, Sarah (2015) Illegal fishing: much more than a conservation problem. Lowy Interpreter, .
Percy, Sarah and Shortland, Anja (2013) Contemporary maritime piracy: five obstacles to ending Somali piracy. Global Policy, 4 1: 65-72. doi:10.1111/1758-5899.12043
Percy, Sarah and Loader, Ian (2012) Bringing the ‘outside’ in and the ‘inside’ out: crossing the criminology/IR divide. Global Crime, 13 4: 213-218.
Percy, Sarah (2011, March 01). Libya ordeal shows it’s time to police mercenaries. , .