1. Ashton, D. and Sung, J. (2006), How competitive strategy matters? Understanding the drivers of training, learning and performance at the firm level. Research paper 66, Centre for Labour Market Studies, University of Leicester.
2. Training investment can mean financial performance;Bassi;Training and Development,1998
3. How much do employers spend on training?;Benson;Training and Development,1996
4. Blagojevich, R. R. (2004), ‘Opportunity return, Office of the Governor of Illinois’. Available at http://www.illinois.gov/pressreleases (accessed 26 July 2007).