“Call Us.” The Drake, a Hilton Hotel Chicago, www.thedrakehotel.com/explore/directions.

“Contents.” Chicagology, chicagology.com/skyscrapers/skyscrapers080/.

Garrido, Ric, et al. “Palmer House Hilton History of Chicago's Oldest Hotel.” Loyalty Traveler, 16 July 2014, loyaltytraveler.boardingarea.com/2014/04/14/palmer-house-hilton-history-of-chicago-oldest-hotel/.

Hilton. “The Mobley Hotel – The Start of Something Big.” Hilton Press Center, Hilton, 10 May 2019, newsroom.hilton.com/brand-communications/news/hiltons-first-hilton.

History of Caesars Palace - Las Vegas Strip, www.lvol.com/hotels/history/h-caesars.html.

Hoover, Gary, et al. “Conrad Hilton: The Dreamer Who Conquered an Industry.” Archbridge Institute, 23 July 2019, www.archbridgeinstitute.org/2018/04/24/conrad-hilton-the-dreamer-who-conquered-an-industry/.

“Palace of Versailles, France (C.1624-98).” Palace of Versailles: History, Architecture, Interior Design, www.visual-arts-cork.com/history-of-art/versailles-palace.htm.

“Palace of Versailles.” Wikipedia, Wikimedia Foundation, 26 Nov. 2019, en.wikipedia.org/wiki/Palace_of_Versailles#The_Salon_of_Mars.

“Palace of Versailles: Facts & History.” LiveScience, Purch, www.livescience.com/38903-palace-of-versailles-facts-history.html.

Philips Color Kinetics. “Lighting the Forum Shops at Caesar's Palace in Las Vegas.” Philips Lighting, 30 Aug. 2018, applications.nam.lighting.philips.com/blog/index.php/2018/08/30/lighting-the-forum-shops-at-caesars-palace-in-las-vegas/.