1. Construction Specifications Institute and Construction Specifications Canada. Uniformat. http://www.csinet.org/uniformat, (last access at 22th, April, 2014).
2. Construction Specifications Institute and Construction Specifications Canada. MasterFormat. http://www.csinet.org/masterformat, (last access at 22th, April, 2014).
3. Innovaya. Innovaya Visual Estimating. http://www.innovaya.com/prod_ve.htm, access at 2014-4-22.
4. Vico. 5D BIM Estimating. http://www.vicosoftware.com/products/5d-bim-software-estimating/tabid/229126/Default.aspx, (last access at 22th, April, 2014).
5. S. Staub-French, M. Fischer, J. Kunz, B. Paulson, An ontology for relating features with activities to calculate costs, Journal of Computing in Civil Engineering, 17(4), (2003), pp. 243-254.