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শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিOrganization for Economic Co-operation and Development, Jacoline Vinke, এবং Winifred Weekes-Vagliani. Environmental Education: An Approach to Sustainable Development. France: OECD, 1993.
M.L.A (9 ম সংস্করণ) উদ্ধৃতিOrganization for Economic Co-operation and Development, et al. Environmental Education: An Approach to Sustainable Development. OECD, 1993.
সতর্কবাণী: সাইটেশন সবসময় 100% নির্ভুল হতে পারে না.