USDA & Economic research service. (2001). Agri-environment polisy at the crossroads: Guideposts on a changing landscape; agricultural economic report No794.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিUSDA এবং Economic research service. Agri-environment Polisy at the Crossroads: Guideposts on a Changing Landscape; Agricultural Economic Report No794. 2001.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিUSDA এবং Economic research service. Agri-environment Polisy at the Crossroads: Guideposts on a Changing Landscape; Agricultural Economic Report No794. 2001.
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