O'Brien, D. (2009). In the heat of battle: A history of those who rose to the occasion and those who didn't. Osprey.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)O'Brien, Donough. In the Heat of Battle: A History of Those Who Rose to the Occasion and Those Who Didn't. Oxford, U.K. ; New York: Osprey, 2009.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)O'Brien, Donough. In the Heat of Battle: A History of Those Who Rose to the Occasion and Those Who Didn't. Osprey, 2009.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.