Project 1:
References

[1] "building facade: maintenance and cleaning". [Online]. Available: https://www.masterbuilder.co.in/building-facade-maintenance-and-cleaning/

[2] "skyscraper. (2018)". [Online]. Available: http://www.skyscrapercenter.com/countries

[3] "how much do commercial window clenaers cost?, kompareit". [Online]. Available: https://www.kompareit.com/business/cleaning-commercial-window-cost.html.

[4] "shanghai window cleaning cradle swings out of control". [Online]. Available: https://www.bbc.com/news/av/world-asia-china-32176401/shanghai-windowcleaning- cradle-swings-out-of-control

[5] "korea occupational health safety agency". [Online]. Available: http://www.kosha.or.kr/english/legislation/occupationalSafetyAndHealth.do