2Robert, E. L. (2003), “3PLs Eye Further Supply Chain Integration”, Purchasing, (3) :13.
3Coase, R. (1937),“The Nature of the Firm”. Economica, (4) : 386 - 405.
4Williamson, O. E. (1975), “Transaction - cost Economics”, Journal of Law and Economics, (22) : 233 - 261.
5Alan, D. S. & W.T. Rupp, (2003),“Application Service Providers: An Application of the Transaction Cost Model”, International Management & Computer Security,2003, ( 11 ).
