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Trích dẫn kiểu MLA (xuất bản lần thứ 9)International Conference on Environmentally Sustainable Development (1st : 1993 : World Bank), et al. Valuing the Environment: Proceedings of the First Annual International Conference on Environmentally Sustainable Development Held at the World Bank, Washington, D.C., September 30-October 1, 1993. World Bank, 1994.