@article {Comparing2007,
title = {Comparing the Travel Cost Method and the Contingent Valuation Method - An Application of Convergent Validity Theory to the Recreational Value of Irish Forests},
year = {2007},
url = {https://www.esri.ie/publications/comparing-the-travel-cost-method-and-the-contingent-valuation-method-an-application-of},
author = {Mayor, K., Scott, S., and Tol, R.},
journal = {ESRI Working Paper 190},
}