1) Becker, G.: A theory of the allocation of time, The Economic Journal, Vol.75, pp.493-517, 1965.
2) De Serpa, A. C.: A Theory of The Economics of Time, The Economic Journal, Vol.81, No.324, pp.828-846, 1971.
3) De Donnea F. X.: Consumer behavior, transport mode choice and value of time: some micro-economic models, Regional and Urban Economics, Vol.1, No.4, pp.355-382, 1972.
5) Train, K. and McFadden, D.: The goods/leisure tradeoff and disaggregate work trip mode choice models, Transportation Research, Vol.12, pp.349-353, 1978.