Meta-analysis of UK Values of Travel Time: An Update
Pedro A.L. Abrantes, Mark R. Wardman
Transportation Research Part A: Policy And Practice, vol. 45, 2011, p. 1-17.

Stated Choice Valuations of Traffic Related Noise
Elisabete Arsenio, Abigail L. Bristow, Mark R. Wardman
Transportation Research: Part D: Transport And Environmen, vol. 11, 2006, p. 15-31.