Economic Valuation with Stated Preference Techniques. A manual. - Bateman, Ian J.; Carson, Richard T.; Day, Brett; Hanemann, Michael; Hanley, Nick; Hett, Tannis; Jones-Lee, Michael; Loomes, Graham; Mourato, Susana; Özdemiroğlu, Ece; Pearce, David W.; Sugden, Robert; et al. (Edward, Elgar, 2002)