1. Accent & Hague Consulting Group (AHCG): The Value of Travel Time on UK Roads. Prepared for Department for Transport. Accent and HCG, London (1999)
2. Algers, S., Dillén, J.L., Widlert, S.: The national Swedish value of time study. In: Proceedings of Seminar F, PTRC Summer Annual Meeting 1995, pp. 133–149. London: PTRC (1995)
3. Bates, J.: Measuring travel time values with a discrete choice model—a note. Econ. J. 97, 493–498 (1987)
4. Bates, J.: Business value of time and crowding—some thoughts. Private communication (2007)
5. Becker, G.S.: A theory of the allocation of time. Econ. J. 75, 493–517 (1965)