Two recent reviews articles on Travel Cost Models. The first is a shorter enyclopedia entry. The second is an update of the my chapter in the Primer for Non-market Valuation.
Parsons, G. R. (2013) Travel Cost Methods. In Shogren, J. F. (ed.) Encyclopedia of Energy, Natural Resource, and Environmental Economics, Vol. 3, pp. 349-358 Amsterdam: Elsevier.
Parsons, G. R. (forthcoming) Travel Cost, In Champ, P., Boyle, K. and Brown, T. (ed.) A Primer for Non-Market Valuation,
Click on book image below for older version of primer (new version coming in 2014) and new encyclopedia entry.