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"New York Life Building". National Historic Landmark summary listing. National Park Service. September 16, 2007. Archived from the original on June 6, 2011.
"New York Life Building". National Historic Landmark summary listing. National Park Service. September 16, 2007. Archived from the original on June 6, 2011.
"New York Life Insurance". Madison Square Park Conservancy. August 8, 2014. Archived from the original on February 27, 2020. Retrieved February 27, 2020.
Moudry, Roberta (2005). "The Corporate and the Civic: Metropolitan Life's Home Office Building". In Moudry, Roberta (ed.). The American Skyscraper: Cultural Histories. Cambridge University Press. p. 122. ISBN978-0-52162-421-3. Archived from the original on June 25, 2021. Retrieved October 3, 2020.
"Plan Big Building on Garden Site". Brooklyn Times-Union. April 19, 1924. p. 7. Archived from the original on February 26, 2020. Retrieved February 26, 2020 – via newspapers.com.
"May Raze Garden for a Skyscraper". Brooklyn Times-Union. May 17, 1924. p. 3. Archived from the original on May 1, 2022. Retrieved February 26, 2020 – via newspapers.com.
Gilbert, Cass (2000). Inventing the skyline : the architecture of Cass Gilbert. Heilbrun, Margaret., New-York Historical Society. New York: Columbia University Press. p. 147. ISBN0-231-11872-4. OCLC43227473.