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United Nations Environment Programme ,  [Factsheets on Sustainable Public Procurement in National Governments: Supplement to the Global Review of Sustainable Public Procurement 2017] ,  [2017 Global Review of Sustainable Public Procurement] ,  2017 Global Review of Sustainable Public Procurement

United Nations Environment Programme ,  International Resource Panel ,  [Natural Resource Use in the Group of 20: Status, Trends, and Solutions] ,  Natural Resource Use in the Group of 20: Status, Trends, and Solutions

United Nations Environment Programme ,  International Resource Panel ,  [Natural Resource Use in the Group of 20: Status, Trends, and Solutions - United States of America [Factsheet]] ,  Natural Resource Use in the Group of 20: Status, Trends, and Solutions - United States of America [Factsheet]