Schmidt, Jan-Simon, and Rainard Osebold. “Environmental Management Systems As a Driver for Sustainability: State of Implementation, Benefits and Barriers in German Construction Companies”. Journal of Civil Engineering and Management 23, no. 1 (January 19, 2017): 150-162. Accessed September 20, 2019. https://journals.vgtu.lt/index.php/JCEM/article/view/593.