Ian (2010-08-15). "Magical Hystory Tour: Skyscrapers". Magical Hystory Tour. Archived from the original on 2015-06-29. Diakses tanggal 2021-11-05.Pemeliharaan CS1: Url tak layak (link)
Ian (2010-08-15). "Magical Hystory Tour: Skyscrapers". Magical Hystory Tour. Archived from the original on 2015-06-29. Diakses tanggal 2021-11-05.Pemeliharaan CS1: Url tak layak (link)
wikipedia.org
en.wikipedia.org
"Skyscraper". Wikipedia (dalam bahasa Inggris). 2021-11-04.