6MORSE P M.Library effectiveness:a system approach[M].Cambridge,Massachusetts:M.I.T.Press,1968.
7LANCASTER F W.The measurement and evaluation of libraryservices[M].Washington D.C.:Information ResourcesPress,1977.
8LOOMIS J B,WALSH R G.Recreation economic decisions:comparing benefits and costs[M].US:Venture PublishingInc,1997:33-41.
9MITCHELL R C,CARSON R D.Using surveys to value publicgoods:the contingent valuation method(resources for the fu-ture)[M].Washington IX:RFF Press,1989:29-30.
10DAVIS R K.Recreation planning as an economic problem[J].Natural Resource Journal,1963,15(3):240-249.
