Gray, J. A. (2002). Forest concession policies and revenue systems: Country experience and policy changes for sustainable tropical forestry. Washington, D. C: The World Bank.
استشهاد بنمط شيكاغوGray, John A. Forest Concession Policies and Revenue Systems: Country Experience and Policy Changes for Sustainable Tropical Forestry. Washington, D. C: The World Bank, 2002.
MLA استشهادGray, John A. Forest Concession Policies and Revenue Systems: Country Experience and Policy Changes for Sustainable Tropical Forestry. Washington, D. C: The World Bank, 2002.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.