- Day & Zimmermann. "Sixty five Years with the Men of Day & Zimmermann." [Philadelphia: 1966 or 7]
- Gardiner, F. M. "Architecture and Industry, Illustrated by Examples of the Work of Day & Zimmermann of Philadelphia." American Architect 109:2 (10 May 1916): 297-304.
- Yoh, Harold L., Jr. Day & Zimmermann, Inc., Dedicated to Excellence for 80 Years (1901-1981). New York: Newcomen Society in North America, 1981.
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