1. Estimating the effect of training programmes on earnings;Ashenfelter;The Review of Economics and Statistics,1977
2. Estimating the effect of training programmes with non-random selection;Bassi;Review of Economics and Statistics,1983
3. An Investigation of the Measurable Economic Value Provided by the Commonwealth Rehabilitation Service;Beggs,1989
4. A multivariate analysis of a vocational rehabilitation programme;Bellante;The Journal of Human Resources,1972