1. A forest of other issues;Baines;Landscape Des.,2000
2. Willingness-to-pay question format effects in contingent valuation studies;Bateman,1999
3. Economic Valuation with Stated Preference Techniques: A Manual;Bateman,2002
4. Contingent valuation;Bishop,1995
5. Measuring non-use values: theory and empirical applications;Bishop,1997