5Adams William J,Yellen Janet L.Commodity bundling and the burden of monopolyThe Quarterly Journal of Economics,1976.
6Jan G Laarman,HansM.Gregersen.Pricing Policy in Nature-based TourismTourism Management,1996.
7Kevin F.McCardle,Kumar Rajaram,Christopher S.Tang.Bundling Retail Products:Models and AnalysisEuropean Journal of Operational Research,2007.
8Wu,L,Zhang,J,Fujiwara,A.Representing Tourist’’s Time Use Behavior based on A Multiple Dis-crete-continuous Extreme Value ModelJournal of the Eastern Asia Society for Transportation Studies,2011.