- cityexperiences.com tr/blog/chicago-willis-tower/Daha Önce Sears Tower Olarak Biliniyordu. Willis Kulesi'nden ve genel olarak öneminden bahsetmeden Chicago mimarlık tarihi hakkında konuşamazsınız.
- hiddenarchitecture.net willis-tower-formerly-…This view gives a more concise understanding of the height of the Willis Tower (especially because it was built in 1974) and its sublime relation with the context.
- newworldencyclopedia.org entry/Willis_TowerThe Willis Tower, built and still commonly referred to as Sears Tower, is a 108-storey, 1,451-foot (442 m) skyscraper in Chicago, Illinois, United States.
- eksisozluk.com sears-tower--92043abd'nin en yuksek, dunyanin ise 3. en yuksek binasidir. cikmak icin tarih itibariyle $9.5 bayilmaniz gerekiyor. http://www.sears-tower.com/index.html.
- som.com projects/willis-tower-formerly-sears-…For decades the tallest building in the world, the 110-story Willis Tower (formerly Sears Tower) marked a major step in exemplifying and defining SOM’s belief...
- turrehberin.com willis-sears-tower/Willis (Sears) Tower , 1973 yılında 108 kat ve 442 metre yükseklik ile yapımı tamamlandığında dünyanın en yüksek binası ünvanını alan ve 25 yıl.
- facebook.com searstower/Sears Tower, Chicago, IL. 3,870 likes. Celebrating 50 years of Chicago's most well-known skyscraper.
- thechicagotraveler.com sears-tower/Unfortunately, the '80s brought Sears plenty of retailing competition (Kmart, Wal-mart, etc), and the Tower did not draw as many office renters as Sears had hoped.
- lifestyle.iloveindia.com lounge/facts-about-sears…The Sears Tower, now known as Willis Tower, is a perfect example of revolutionary bundled-tube structural design.