1. UNEP (United Nations Environmental, Programme), Buildings and Climate Change: Status, Challenges, and Opportunities. 〈https://www.unglobalcompact.org/docs/issues_doc/Environment/climate/Buildings_and_climate_change.pdf〉 (Accessed 28 March 2018), 2007.
2. European Commision, Buildings. 〈http://ec.europa.eu/energy/en/topics/energy-efficiency/buildings〉 (Accessed 31 May 2017).
3. Global material Flows and Resource Productivity. An Assessment Study of the UNEP International Resource;UNEP,2016
4. OECD, Material Resources, Productivity and the Environment. 〈https://doi.org/10.1787/9789264190504-en〉, 2013.
5. European Commision, Raw Materials Scoreboard – European Innovation Partnership on Raw Materials, 2016. 〈https://dx.doi.org/10.2873/28674〉.