ELS Group (2004) Asphalt Emission Study: Shelly and Sands Conventional Mix and Warm Mix Asphalt Paving State Route 541 Coshocton and Guernsey Counties, Ohio August to September 2004. Report for Project No. 2004-103-R, ELS Group, Dublin.
 Romier, M., Koenders, B.G., Stoker, D.A., Robertus, C., Larsen, O. and Johansen, J. (2004) WAM-Foam, Asphalt Production at Lower Operating Temperatures. Proceedings, 9th Conference of International Society for Asphalt Pavements, Copenhagen, 2002, 17-19.
 U.S. Environmental Protection Agency (2008) Clean Air Interstate Rule: Iowa.
 Button, J.W., Estakhri, C. and Wimsatt, A. (2007) A Syn-Report of Warm-Mix Asphalt. Report No. SWUTC/07/0-5597-1. Texas Transportation Institute, The Texas A and M University System, College Station.
 Jenkins, K.J., de Groot, J.L.A., van de Ven, M.F.C. and Molenaar, A.A.A. (1999) Half-Warm Foamed Bitumen Treatment, a New Process. 7th Conference on Asphalt Pavements for Southern Africa, Victoria Falls, 1999, 27-32.
 Cervarich, K., Abraham, J., Butz, T., Hildebrand, G. and Riebeseh, L. (2003) Asphalt Flow Improvers as Intelligent Fillers for Hot Asphalts—A New Chapter in Asphalt Technology. Sasol Wax GmbH, Hamburg.
 Alhassan, H.M. and Suleiman Arafat, Y. (2015) Evaluation of Nigerian Based Bitumen Modified with Additives. International Conference on Safe, Efficient and Sustainable Road Transportation in Nigeria, Abuja, 23-25 June 2015, 3-5.
 Westvaco, M. (2012) Evotherm and Warm Mix Asphalt Production Information.
 Buss, A. and Gordon, D. (2011) Fundamental Binder and Practical Mixture Evaluation of Polymer Modified Bituminous Materials. International Journal of Pavement Engineering, 5, 137-151.