1. AEA Technologies 2009 Carbon footprinting of policies, programmes, and projects http://laqm.defra.gov.uk/documents/AEAPTEGCarbonFootprintingfinalversion2009.pdf
2. AMTRAK 2014 National Railroad Passenger Corporation, AMTRAK, fiscal years 2013-2017 five year plan www.amtrak.com/ccurl/976/814/Amtrak-Five-Year-Financial-Plan-FY2013-2017,0.pdf
3. Environmental assessment of passenger transportation should include infrastructure and supply chains;Chester;Environmental Research Letters,2009
4. Life-cycle energy and emissions of California high-speed rail;Chester;Environmental Research Letters,2010