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.
Παραπομπή σε μορφή Chicago (17η εκδ.)Hammond, Allen L. Environmental Indicators: A Systematic Approach to Measuring and Reporting on Environmental Policy Performance in the Context of Sustainable Development. Washington: World Resources Institute, 1995.
Παραπομπή σε μορφή MLA (9th εκδ.)Hammond, Allen L. Environmental Indicators: A Systematic Approach to Measuring and Reporting on Environmental Policy Performance in the Context of Sustainable Development. World Resources Institute, 1995.
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