Oberlender, Garold D.; Trost, Steven M. (June 2001). "Predicting Accuracy of Early Cost Estimates Based on Estimate Quality". Journal of Construction Engineering and Management. 127 (3): 173–182. doi:10.1061/(ASCE)0733-9364(2001)127:3(173).
García de Soto, B.; Adey, B. T.; Fernando, D. (2014). "A process for the development and evaluation of preliminary construction material quantity estimation models using backward-elimination-regression and neural networks". Journal of Cost Analysis and Parametrics. 7 (3): 180–218. doi:10.1080/1941658X.2014.984880. S2CID62587136.
GAO Cost Estimating and Assessment Guide, Twelve Steps of a High-Quality Cost Estimating Process, on the Internet at https://www.gao.gov/new.items/d093sp.pdf (visited 07/04/2019)
García de Soto, B.; Adey, B. T.; Fernando, D. (2014). "A process for the development and evaluation of preliminary construction material quantity estimation models using backward-elimination-regression and neural networks". Journal of Cost Analysis and Parametrics. 7 (3): 180–218. doi:10.1080/1941658X.2014.984880. S2CID62587136.