6L. L. Berry, A. Parasuraman. Marketing Services: Competing Through Quality. NY: The Free Press, 1991. p9.
7Fritz M.The Production and Distribution of Knowl-edge in the United States[M].Princeton:Princeton University Press,1962.
8Greenfield H I.Manpower and the Growth of Pro-ducer Services[M].New York:Columbia University Press,1966.
9Browing H C,Singelman J.The Emergence of a Service Society:Demographic and Socuaologucal As-pect of the Sectoral Transformation in the Labor of the USA National Technical Information Service[M].Springfield:National Technical Information Service,1975.
10Grubel H G,Walker M A.Service Industry Growth:Cause and Effects[R].Vancouver:Fraser Institute,1989:279-282.
