Boustead, I. (2005). "Polyurethane rigid foam"(PDF). Eco-Profiles of the European Plastics Industry. Brussels: PlasticsEurope. Archived from the original(PDF) on 25 September 2013. Retrieved 5 November 2017.
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Boustead, I. (2005). "Polyurethane rigid foam"(PDF). Eco-Profiles of the European Plastics Industry. Brussels: PlasticsEurope. Archived from the original(PDF) on 25 September 2013. Retrieved 5 November 2017.