1. Abraham, K.G., Taylor, S.K., 1993. Firms’ use of outside contractors: Theory and evidence. NBER Working Paper No. 4468, NBER, Cambridge, MA.
2. Bendor-Samuel, P., 1998. The brave new world of outsourcing. http://www.outsourcing-journal.com/issues/may1998/html/everest.html.
3. Flexibility and theory of the organization;Carlson;International Journal of Industrial Organization,1989
4. Coase, R., 1937. The nature of the firm. In: Williamson, O.E., Winther, G. (Eds.), The Nature of the Firm (1991). Oxford University Press, Oxford.
5. Coombs, R., Battaglia, P., 1998. Outsourcing of business services and the boundaries of the organization. CRIC Working Paper No. 5.