고층 건물의 사용 증가
Council on Tall Buildings and Urban Habitat
http://www.ctbuh.org/HighRiseInfo/TallestDatabase/Criteria/tabid/446/language/en-US/Default.aspx
가장 높은 건물 (13세기 ~ 1901년)
웨이백 머신 - 위키백과, 우리 모두의 백과사전
https://ko.wikipedia.org/wiki/%EC%9B%A8%EC%9D%B4%EB%B0%B1_%EB%A8%B8%EC%8B%A0A Brief History of the World's Tallest Buildings - Photo Essays - TIME
https://web.archive.org/web/20100410070137/http://www.time.com/time/photogallery/0,29307,1950812_2018362,00.htmlPage not found | TIME
http://www.time.com/time/photogallery/0,29307,1950812_2018362,00.html