Disputed due to the fact that the Willis/Sears Tower is taller than the Petronas Towers by tip height, roof height, & highest occupied floor."Petronas vs. Sears Tower Controversy". Retrieved February 24, 2024.
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Hoyt, Monty (June 22, 1973). "Sears Tower, world's tallest, may also be world's safest: No alternative to safety "Bundled tube" design". The Christian Science Monitor. p. 12. ProQuest511514170.
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"Sears Tower Now Tallest In Nation". The Washington Post, Times Herald. June 2, 1973. p. E12. ISSN0190-8286. ProQuest148412303.
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Metz, Tim (March 4, 1974). "Where's the Highest Structure in World? Well, It's Not Chicago: New Toronto Tower May Kill Birds and Induce Vertigo, But Some Think It's Great". The Wall Street Journal. p. 1. ISSN0099-9660. ProQuest133852336.
Martin, Paul R. (January 20, 1971). "A Rising Competition: It's Hard to Say Which Is Tallest Building: Trade Center and Sears Building Vie but Won't Admit It; Should a TV Tower Count?". The Wall Street Journal. p. 1. ISSN0099-9660. ProQuest133622903.
"Sears to Shoo Ghosts By Putting TV Masts Atop Its Skyscraper: Work on Bases May Be Started In December for Move From Chicago John Hancock Sites". The Wall Street Journal. August 15, 1972. p. 11. ISSN0099-9660. ProQuest133688461.
"Sears to Shoo Ghosts By Putting TV Masts Atop Its Skyscraper: Work on Bases May Be Started In December for Move From Chicago John Hancock Sites". The Wall Street Journal. May 22, 1973. p. 8. ISSN0099-9660. ProQuest133807447.
Žaknić, Ivan; Smith, Matthew; Rice, Dolores B.; Council on Tall Buildings and Urban Habitat (1998). 100 of the world's tallest buildings. Gingko Press. p. 207. ISBN3-927258-60-1. OCLC40110184.
"Sears Tower Now Tallest In Nation". The Washington Post, Times Herald. June 2, 1973. p. E12. ISSN0190-8286. ProQuest148412303.
Metz, Tim (March 4, 1974). "Where's the Highest Structure in World? Well, It's Not Chicago: New Toronto Tower May Kill Birds and Induce Vertigo, But Some Think It's Great". The Wall Street Journal. p. 1. ISSN0099-9660. ProQuest133852336.