Below are the resources referred to or cited by the developer(s) of the original unit:
Barron, B (1993) ‘From the editor', Asian Journal of Environmental Management, 1(1): iii, May.
Civic Exchange (2009a) The Air We Breathe 2: Dialogue on Road Transportation, Expert Symposium Summary Report, http://www.civic-exchange.org/en/live/upload/files/091127report.pdf
Civic Exchange (2009b) The Air We Breathe 2: Dialogue on Road Transportation, Public Conference Summary Report, http://www.civic-exchange.org/en/live/upload/files/091128report.pdf
Ministry of Environmental Protection of the People's Republic of China (2009) Report on the State of the Environment in China 2008.
McKinsey Global Institute (2009) Preparing for China's Urban Billion, McKinsey & Company, http://www.mckinsey.com/mgi/publications/china_urban_billion.
McKinsey Global Institute (2009) Preparing for China's Urban Billion, McKinsey & Company, http://www.mckinsey.com/mgi/publications/china_urban_billion.
Ministry of Environmental Protection of the People's Republic of China (2009) Report on the State of the Environment in China 2008.
Rees, W and Wackernagel, M (1996) Our Ecological Footprint, New Society Publishers, Gabriola Island.
United Nations (2008) World Urbanization Prospects — The 2007 Revision.
WWF (2008) Living Planet Report 2008, http://assets.panda.org/downloads/living_planet_report_2008.pdf.
WWF Hong Kong (2008) Hong Kong Ecological Footprint Report 2008: Living Beyond Our Means, http://www.footprintnetwork.org/images/uploads/Ecological_Footprint_HongKong.pdf.
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