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Chapman, Parke (December 12, 2006). "Top Price for Top of the Sixes". National Real Estate Investor. Archived from the original on February 3, 2015. Retrieved September 30, 2016.
Weiss, Lois (April 21, 2010). "Lawyers take a Fifth lease". New York Post. Archived from the original on September 18, 2020. Retrieved November 5, 2020.
"The 32nd Academy Awards | 1960". Oscars.org | Academy of Motion Picture Arts and Sciences. Archived from the original on May 20, 2019. Retrieved January 22, 2018.
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"Elevators to Adjust to Rider Demand". The Christian Science Monitor. November 9, 1956. p. 17. ProQuest509475728.
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Guenther, Robert (June 18, 1986). "Deal Maker Adapts Financing To Cope With Tax Overhaul". The Wall Street Journal. p. 1. ISSN0099-9660. ProQuest397953443.
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"Sumitomo Agrees to Buy 666 Fifth Ave. In New York for $500 Million, Sources Say". The Wall Street Journal. June 5, 1987. p. 1. ISSN0099-9660. ProQuest398039312.
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Branch, Mark Alden (June 1998). "911 for 666". The International Design Magazine. Vol. 45, no. 4. p. 24. ProQuest214758002.
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"Variations on a Theme"(PDF). Architectural Record. Vol. 120, no. 3. September 1956. p. 11. Archived(PDF) from the original on July 19, 2020. Retrieved June 16, 2021.
Chakrabarti, Vishaan; Keenan, Jesse M. (2013). "666 Fifth Avenue: A Case Study"(PDF). Columbia University Center for Urban Real Estate. Archived(PDF) from the original on July 13, 2019. Retrieved June 21, 2019.
"Variations on a Theme"(PDF). Architectural Record. Vol. 120, no. 3. September 1956. p. 11. Archived(PDF) from the original on July 19, 2020. Retrieved June 16, 2021.
Chapman, Parke (December 12, 2006). "Top Price for Top of the Sixes". National Real Estate Investor. Archived from the original on February 3, 2015. Retrieved September 30, 2016.
Weiss, Lois (April 21, 2010). "Lawyers take a Fifth lease". New York Post. Archived from the original on September 18, 2020. Retrieved November 5, 2020.
Gault, Ylonda (March 12, 1995). "New York Architects Go on With the Show". Crain's New York Business. Vol. 11, no. 11. p. 3. Archived from the original on November 29, 2020. Retrieved June 16, 2021.
"The 32nd Academy Awards | 1960". Oscars.org | Academy of Motion Picture Arts and Sciences. Archived from the original on May 20, 2019. Retrieved January 22, 2018.
"Famine". Good Omens Lexicon. The Good Omens Lexicon. Archived from the original on January 15, 2021. Retrieved June 16, 2021.
"Integrated Resources Buys New York Office Building". The Wall Street Journal. May 19, 1986. p. 56. ISSN0099-9660. ProQuest135202904.
Guenther, Robert (June 18, 1986). "Deal Maker Adapts Financing To Cope With Tax Overhaul". The Wall Street Journal. p. 1. ISSN0099-9660. ProQuest397953443.
"Asbestos Fireproofing Hinders Sales of Some Office Buildings". The Wall Street Journal. July 16, 1986. p. 1. ISSN0099-9660. ProQuest398020384.
"Sumitomo's Accord to Buy Manhattan Site Announced". The Wall Street Journal. June 8, 1987. p. 48. ISSN0099-9660. ProQuest135336162.
"Sumitomo Agrees to Buy 666 Fifth Ave. In New York for $500 Million, Sources Say". The Wall Street Journal. June 5, 1987. p. 1. ISSN0099-9660. ProQuest398039312.
"Sale of Manhattan Site To Sumitomo Is Completed". The Wall Street Journal. August 5, 1987. p. 1. ISSN0099-9660. ProQuest398107892.