1. Construction Intelligence Center Global Construction Outlook 2020 (Construction Intelligence Center 2015).
2. International Labour Organization Facts on Safety at Work (International Labour Organization 2005).
3. T. A. Edison Apparatus for the production of concrete structures U.S. Patent 1326854 (1919).
4. International Association for Automation and Robotics in Construction Robots and Automated Machines in Construction (International Association for Automation and Robotics in Construction 1998).
5. Automated construction in Japan