6Svanhild Aab0. Libraries and return on investment(ROI): a meta-analysis[J]. New Library World, 2009,110(7):311-323.
7Donald S Elliott, Glen E Holt, Sterling W Hayden,Ledie Edmonds Holt. Measuring your library,svalue: How to do a cost-benefit analysis for yourpublic library[M]. Chicago: American LibraryAssociation, 2007:11.
8rary services[J]. Library& Information Science Research, 2011(33):112-119.
9Venkatachalam L. The contingent valuation method:a review[J]. Environmental Impact AssessmentReview, 2004, 24(1):89-124.
10Davis R K. The value of outdoor recreation: aneconomic study of the maine woods[D]. Cambridge:Harvard University, 1963.
