1. BusinessGreen 2013 Green roofs could grow energy savings for London firms www.businessgreen.com/bg/news/2233089/green-roofs-could-grow-energy-savings-for-london-firms
2. Green roof valuation: a probabilistic economic analysis of environmental benefits;Clark;Environmental Science and Technology,2008
3. Communities and Local Government 2005 Generalised land use database http://data.gov.uk/dataset/land_use_statistics_generalised_land_use_database
4. Costain 2013 ‘Green’ awards for Farringdon www.costain.com/news/news-releases/2013/4/2/green-awards-for-farringdon.aspx