1. A service model of air travel demand;Abrahams;Transportation Research,1983
2. Cooper, M.H., Maynard, A.K., 1971. The price of air travel, Hobart Paper 53. Institute for Economic Affairs.
3. Effects of income and price on international tourist demand;Crouch;Annals of Tourism,1992
4. Econometric Analysis;Greene,2000
5. Hooper, P., 1993. The elasticity of demand for travel: a review. Research Report, Institute of Transport Studies, Sydney.