Annex A of WebTAG Unit 3.5.9:
http://www.webtag.org.uk/webdo
5.2 of WebTAG Unit 3.5.4:
http://www.webtag.org.uk/webdo
NESA: http://www.scot-tag.org.uk/
COBA: http://www.dft.gov.uk/pgr/econ
TUBA: http://www.dft.gov.uk/stellent
DfT (2004) QUADRO Manual: http://www.dft.gov.uk/pgr/econ
Sugden, R. (1999) Developing a Consistent Cost-Benefit Framework for Multi-Modal Transport
Green Book: Appraisal and Evaluation in Central Government (2003)
http://www.hm-treasury.gov.uk/
