PATHIEU, Diane. Hundreds of stair climbers reach new heights for annual SkyRise Chicago at Willis Tower. ABC7 Chicago [online]. 2019-11-04 [cit. 2022-02-26]. Dostupné online. (anglicky)
Morgan Stanley moving second office to Willis Tower. Crain's Chicago Business [online]. 2018-04-16 [cit. 2020-04-02]. Dostupné online. (anglicky)
The roller-coaster story behind Willis Tower's billion-dollar payday. Crain's Chicago Business [online]. 2015-03-21 [cit. 2020-04-03]. Dostupné online. (anglicky)
chicagomag.com
MCCLELLAND, Edward. Don't Call These Chicago Landmarks By Their Real Names. Chicago Magazine [online]. 2019-06-05 [cit. 2022-02-23]. Dostupné online. (anglicky)
chipublib.org
Lyle. Technology that Changed Chicago: Fazlur Khan and Tubular Designs for Skyscrapers. www.chipublib.org [online]. 2014-04-13 [cit. 2020-04-12]. Dostupné online. (anglicky)
KOZIARZ, Jay. Chicago’s Willis Tower reveals plan for ambitious $500M makeover. Curbed Chicago [online]. 2017-02-01 [cit. 2021-03-07]. Dostupné online. (anglicky)
KOZIARZ, Jay. Checking in on Willis Tower’s new retail and dining complex. Curbed Chicago [online]. 2019-10-15 [cit. 2021-03-07]. Dostupné online. (anglicky)
KOZIARZ, Jay. Willis Tower is getting faster, greener elevators. Curbed Chicago [online]. 2018-05-08 [cit. 2021-03-07]. Dostupné online. (anglicky)
MetLife to Complete Sale of Chicago's Sears Tower. - Chicago Tribune (Chicago, IL) | HighBeam Research. web.archive.org [online]. 2012-10-26 [cit. 2020-04-08]. Dostupné v archivu pořízeném z originálu dne 2012-10-26.
justonebadcentury.com
SPIDER DAN. www.justonebadcentury.com [online]. Just One Bad Century [cit. 2022-02-25]. Dostupné v archivu pořízeném z originálu dne 2012-03-20. (anglicky)
nbcchicago.com
LUTZ, B. J. Coating on Willis Tower Skydeck's Ledge Cracks Under Tourists [online]. NBC 5 Chicago, 2014-05-29 [cit. 2022-02-24]. Dostupné online. (anglicky)
DELBERT, Caroline. How Much Water Does It Take to Knock Out the Sears Tower?. Popular Mechanics [online]. 2020-05-20 [cit. 2022-02-24]. Dostupné online. (anglicky)
princeton.edu
khan.princeton.edu
Sears Tower - Fazlur Khan - Structural Artist of Urban Building Forms. khan.princeton.edu [online]. [cit. 2020-04-07]. Dostupné v archivu pořízeném z originálu dne 2015-02-26.
ric.org
Climbers Take on Willis Tower for SkyRise Chicago. www.ric.org [online]. Rehabilitation Institute of Chicago (RIC), 2013-10-31 [cit. 2021-02-25]. Dostupné v archivu pořízeném z originálu dne 2014-04-15. (anglicky)
robertfeder.com
FEDER, Robert. Flooding at Willis Tower knocks TV, radio signals off the air - Robert Feder. www.robertfeder.com [online]. 2020-05-20 [cit. 2022-02-24]. Dostupné online. (anglicky)
seaoi.org
History / Past Presidents / Khan Sculpture - A Brief History of SEAOI. www.seaoi.org [online]. Structural Engineers Association of Illinois (SEAOI) [cit. 2020-04-06]. Dostupné online. (anglicky)
Willis Tower. www.skyscrapercenter.com [online]. The Skyscraper Center [cit. 2020-04-02]. Dostupné online. (anglicky)
som.com
www.SOM.com | The Ledge at Skydeck Chicago. web.archive.org [online]. 2011-06-08 [cit. 2020-04-02]. Dostupné v archivu pořízeném z originálu dne 2011-06-08.
suntimes.com
chicago.suntimes.com
SPIELMAN, Fran. Willis Tower in line for a $500 million facelift. Chicago Sun-Times [online]. 2017-01-31 [cit. 2020-04-10]. Dostupné online. (anglicky)
Willis Tower (formerly Sears Tower) – Structural Engineering. SOM [online]. [cit. 2020-04-07]. Dostupné v archivu pořízeném dne 2020-04-07. (anglicky)
Sears Tower - Fazlur Khan - Structural Artist of Urban Building Forms. khan.princeton.edu [online]. [cit. 2020-04-07]. Dostupné v archivu pořízeném z originálu dne 2015-02-26.
Climbers Take on Willis Tower for SkyRise Chicago. www.ric.org [online]. Rehabilitation Institute of Chicago (RIC), 2013-10-31 [cit. 2021-02-25]. Dostupné v archivu pořízeném z originálu dne 2014-04-15. (anglicky)
Urbanspace Willis Tower. Urbanspace [online]. [cit. 2021-03-07]. Dostupné v archivu pořízeném z originálu dne 2021-11-03. (anglicky)
Sears Tower: Headlines. web.archive.org [online]. 2001-12-14 [cit. 2020-04-08]. Dostupné v archivu pořízeném z originálu dne 2001-12-14.
MetLife to Complete Sale of Chicago's Sears Tower. - Chicago Tribune (Chicago, IL) | HighBeam Research. web.archive.org [online]. 2012-10-26 [cit. 2020-04-08]. Dostupné v archivu pořízeném z originálu dne 2012-10-26.
Sears Tower unveils 103rd floor glass balconies - USATODAY.com. usatoday30.usatoday.com [online]. [cit. 2020-04-02]. Dostupné v archivu pořízeném dne 2020-07-31.
www.SOM.com | The Ledge at Skydeck Chicago. web.archive.org [online]. 2011-06-08 [cit. 2020-04-02]. Dostupné v archivu pořízeném z originálu dne 2011-06-08.
SPIDER DAN. www.justonebadcentury.com [online]. Just One Bad Century [cit. 2022-02-25]. Dostupné v archivu pořízeném z originálu dne 2012-03-20. (anglicky)
whycenter.com
Why was the Sears Tower made. www.whycenter.com [online]. [cit. 2020-04-08]. Dostupné online.
