摘要: … survey, each respondent was asked a series of questions, which included questions about their general impressions of the survey, whether they found the survey to be easy or difficult to …
In: A Primer on Nonmarket Valuation. Champ, Patricia A.; Boyle, Kevin J.; Brown, Thomas C. eds. Kluwer Academic Publishers. Dordrecht. 2003.,2003, 引用: 226