Markus Kummer และ Christian Hofstadler. (2016) Frequently Occurring Losses of Productivity in the Shell Construction Phase. ISEC Press:ม.ป.ท.Markus Kummer และ Christian Hofstadler. 2016. Frequently Occurring Losses of Productivity in the Shell Construction Phase. ม.ป.ท.:ISEC Press;Markus Kummer และ Christian Hofstadler. Frequently Occurring Losses of Productivity in the Shell Construction Phase. ม.ป.ท.:ISEC Press, 2016. Print.