Collier, P. (2007). The bottom billion: Why the poorest countries are failing and what can be done about it. Oxford University Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Collier, Paul. The Bottom Billion: Why the Poorest Countries Are Failing and What Can Be Done About It. Oxford ; New York: Oxford University Press, 2007.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Collier, Paul. The Bottom Billion: Why the Poorest Countries Are Failing and What Can Be Done About It. Oxford University Press, 2007.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.