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^ abSharp, Dennis (2002). Twentieth Century Architecture: A Visual History. Images Publishing. p. 424. ISBN 978-1-86470-085-5. Retrieved 26 February 2024.
^Nickels, Thom (2005). Philadelphia Architecture. Arcadia Publishing. p. 139. ISBN 978-0-7385-3798-6. Retrieved 26 February 2024.