1. Buchholz K. IKB Branchenbericht – Gummi- und Kunstoffindustrie. Düsseldorf: IKB Deutsche Industriebank AG 2000 (Sector report – rubber and plastic industry).
2. Office of Integrated and International Energy Analysis, under the direction of John J. Conti. Annual Energy Outlook 2013. Washington: U.S. Energy Information Administration (eia) 2013.
3. Müller E, Stock T, Schillig R. Energy Value-Stream Mapping – A Method to Optimize Value-Streams in Respect of Time and Energy Consumption. In: Michael F. Zaeh (Eds.): Enabling Manufacturing. Competiveness and Economic Sustainability, Proceedings of the 5th International Conference on Changeable, Agile, Reconfigurable and Virtual production (CARV2013), Munich, Germany, 2013, p. 285-290.
4. Müller E, Stock T, Schillig R. Dual Energy Signatures Enable Energy Value-Stream Mapping. Proceedings of 23rd International Conference on Flexible Automation and Intelligent Manufacturing (FAIM), Porto,. Portugal, 2013, p. 1603-1612.
5. Michaeli W. Einführung in die Kunststoffverarbeitung. 5. Aufl. München: Hanser Michaeli, 2006, p. 111 (Introduction to plastic processing).