3DAN LAGO, JAMES KIPP POFFLEY.The Aging population and the hospitality Industry in 2010:important trends and probable services [J/ON]. [2012-03-10]. Journal of Hospitality & Tourism Research,1993 (17) 29-47.Retrieved July 28,2010,from http: //jht. sagepub, com/content/17/1/29.
4JAMES MAK,LONNY CARLILE,SALLY DAI.Impact of population aging on Japanese international travel to 2025 [J/ON]. [2012-02-257] .Journal of Travel Research,2005 (44) :151-162. Retrieved July 07,2010,from http: //jtr. sagepub, corn/ content/44/2/151.