APA
Gray J. A., . (2002). Forest concession policies and revenue systems. Washington, D. C: World Bank.
Chicago
Gray John Andrew, . 2002. Forest concession policies and revenue systems. Washington, D. C: World Bank.
Harvard
Gray J. A., . (2002). Forest concession policies and revenue systems. Washington, D. C: World Bank.
MLA
Gray John Andrew, . Forest concession policies and revenue systems. Washington, D. C: World Bank. 2002.