World Resources Institute & Hammond, A. L. (1995). Environmental indicators: A systematic approach to measuring and reporting on environmental policy performance in the context of sustainable development. World Resources Institute.
Trích dẫn kiểu Chicago (xuất bản lần thứ 7)World Resources Institute và Allen L. Hammond. Environmental Indicators: A Systematic Approach to Measuring and Reporting on Environmental Policy Performance in the Context of Sustainable Development. [Washington, D.C.]: World Resources Institute, 1995.
Trích dẫn kiểu MLA (xuất bản lần thứ 9)World Resources Institute và Allen L. Hammond. Environmental Indicators: A Systematic Approach to Measuring and Reporting on Environmental Policy Performance in the Context of Sustainable Development. World Resources Institute, 1995.