Ascher, W., & Healy, R. G. (1990). Natural resource policymaking in developing countries: Environment, economic growth, and income distribution. Duke University Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Ascher, William, و Robert G. Healy. Natural Resource Policymaking in Developing Countries: Environment, Economic Growth, and Income Distribution. Durham: Duke University Press, 1990.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Ascher, William, و Robert G. Healy. Natural Resource Policymaking in Developing Countries: Environment, Economic Growth, and Income Distribution. Duke University Press, 1990.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.