1. AACE (1997). Recommended practice no. 17R-97 (1997): Cost estimate classification system. AACE, Inc.
2. ACP (2008). Road repair costs are exploding [Cited 2008 July 8]. .
3. Factors affecting contractors’ risk of cost overburden;Akinci;Journal of Management in Engineering,1998
4. Analysis of factors influencing project cost estimating practice;Akintoye;Construction Management and Economics,1998
5. Preliminary cost estimation of highway construction using neural networks;Al-Tabtabai;Cost Engineering,1999