References

Alaa, Z. and O. Garold, 1993. Early Warning Signs of Project Variations. Oklahoma State University, Okla, Finland, pp: 37-49.

Charles, A., 1987. Specifications for Architecture Engineering and Construction. 2nd Edn., John Wiley and Sons Inc., New York, ISBN: 0-7695-0268-7, pp: 46-54.

Cooper, D.R. and C.W. Emory, 1995. Business Research Methods. 5th Edn., Irwin Inc., Chicago, pp: 411-526.

Edward, R.F., 1998. Construction Project Administration. 3rd Edn., Hohn Wiley and Sons Inc., New York, ISBN: 0471888850, pp: 225-351.

Hanna, A.S., C. Richard, P.A. Peterson and E.V. Nordheim, 2002. Quantitative definition of projects impacted by Change orders. J. Constr. Eng. Mgnage., 128: 57-64.
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Ibbs, C.W., Y.H. Kwak, T. Ng and A.M. Odabasi, 2003. Project delivery systems and project change: Quantitative analysis. J. Constr. Eng. Manage. ASCE, 129: 382-387.