1. Trends in Global CO2 emissions: 2016 report;Olivier;The Hague,2016
2. VDZ, Zementindustrie im Überblick 2018 / 2019, Düsseldorf, 2019.
3. Making Concrete Change: Innovation in Low-carbon Cement and Concrete;Lehne,2018
4. Cement Industry Energy and CO2 Performance: Getting the Numbers Right (GNR), 2016. https://www.wbcsd.org/Sector-Projects/Cement-Sustainability-Initiative/Resources/Cement-Industry-Energy-and-CO2-Performance.
5. VDZ, Environmental Data of the German Cement Industry, Düsseldorf, 2018.