Ludowici Roof Tile (English Wikipedia)

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"Roofing Tile Concern Absorbs the Plant and Plant and Business of the Imperial Company". Clay Record Volumes 27-28. Clay Record Publishing Company. 1905. p. 34. Retrieved 28 March 2023.
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businessinsider.com

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"Saint-Gobain Terreal Sold". CeramicNews. September 2003. Retrieved 31 March 2023.

Kamin, Blair (9 August 2016). "Wrigley Field remake: Now it's beautiful outside, too". Chicago, Illinois: Chicago Tribune. Retrieved 31 March 2023.

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Manfrin, Jennifer L. "Tile as old as time". Times Recorder - Zanesville, OH. Retrieved 28 March 2023.
"A Terra Cotta Co". Hornellsville, New York: Hornellsville Weekly Tribune. 22 March 1889. Retrieved 28 March 2023.
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"Canal tiles kept factory up". Montgomery, Alabama: The Montgomery Times. 27 October 1913. Retrieved 29 March 2023.
"To double the plant". The Sun. Coffeyville, Kansas. 21 November 1913. Retrieved 29 March 2023.
Markham, Wayne (2 January 1983). "Feats of clay". Miami, Florida: The Miami Herald. Retrieved 28 March 2023.
"Announcing Closure Of A Plant Operated In Kansas". Zanesville, Ohio: The Times Recorder. 28 December 1956. Retrieved 30 March 2023.
"CertainTeed Purchases Assets of Tile Maker, Ludowici-Celadon". Zanesville, Ohio: The Times Recorder. 16 July 1989. Retrieved 31 March 2023.
Gadd, Brian (27 September 2007). "Ludowici opens new hands-on design center". Zanesville, Ohio: The Times Recorder. Retrieved 31 March 2023.
"Perry Sends Gold Roof To New York". Newark, Ohio: Newark Advocate. 28 April 1966. Retrieved 28 March 2023.
Markham, Wayne (2 January 1983). "Feats of clay". Miami, Florida: The Miami Herald. Retrieved 31 March 2023.

Gamarekian, Barbara (24 July 1986). "Terra Cotta Comes Back". The New York Times. New York, New York. Retrieved 31 March 2023.

"The Plaza Hotel - New York, NY". Ludowici. Ludowici Roof Tile, LLC. Retrieved 31 March 2023.

"Frequently Asked Questions About the Capitol". Pennsylvania Capitol Preservation Committee. Capitol Preservation Committee. Retrieved 28 March 2023.

Brunner, Jan. "Falzziegelwerk Carl Ludowici". Institut für Geschichtliche Landeskunde. Retrieved 28 March 2023.

Bracken, Drew (3 February 2019). "CEO credits employees for company's success". Zanesville, Ohio: Zanesville Times Recorder. Retrieved 28 March 2023.