Percy, S. (2007). Mercenaries: The History of a Norm in International Relations. Oxford University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPercy, S. Mercenaries: The History of a Norm in International Relations. Oxford University Press, 2007.
एमएलए (9वां संस्करण) प्रशस्ति पत्रPercy, S. Mercenaries: The History of a Norm in International Relations. Oxford University Press, 2007.
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