Organisation for Economic Co-operation and Development & Seminar on Environmental Benefits from Agriculture. (1997). Environmental benefits from agriculture: Issues and policies : the Helsinki Seminar. Organisation for Economic Co-operation and Development ; OECD Washington Center [distributor].
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিOrganisation for Economic Co-operation and Development এবং Seminar on Environmental Benefits from Agriculture. Environmental Benefits from Agriculture: Issues and Policies : The Helsinki Seminar. Paris : Washington D. C.: Organisation for Economic Co-operation and Development ; OECD Washington Center [distributor], 1997.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিOrganisation for Economic Co-operation and Development এবং Seminar on Environmental Benefits from Agriculture. Environmental Benefits from Agriculture: Issues and Policies : The Helsinki Seminar. Organisation for Economic Co-operation and Development ; OECD Washington Center [distributor], 1997.