- Search for your Ancestors, Ancestry Library Edition, 19 March 2006.
- Leibert & Macneil mentioned in Daily Mining Gazette, 5 August 1905, and ad 19 August 1905.
- Polk Directory, 1910. Daily Mining Gazette 16 December 1905.
- Evening Copper Journal, 20 October 1909, and Gundlach Collection, 85V.
- Fourteenth Census of the United States, Ancestry Library Edition, 19 March 2006.
- Search for your Ancestors, Ancestry Library Edition, 19 March 2006.
- Architectural drawings in collection of Keweenaw National Historical Park Archives.
- Bruce Nolen, "To God Be The Glory" (brochure, 2007).
- “Dedication of Fine Church a Notable Event,” Calumet News, 29 June 1908.
- “Dedication of Fine Church a Notable Event,” Calumet News, 29 June 1908.
- Hunts’ Guide to Michigan’s UPPER PENINSULA, 26 February 1997, Hunts-upguide, 15 April 2006.
- Drawings of Ahmeek Mine Office, signed by Paul Humphrey Macneil, 13 April 1908, in Drawer 197 of C&H Drawing Collection, MTU Archives.
- Nicki Lassila, “History of Chassell,” Chassell, Michigan:100 Years of Pride (privately printed, 1988).
- “Chassell Man Is Head of Big New Lumber Company,” Calumet News, 3 August 1908.
- “An Old English Country House,” Calumet News, 4 September 1908.
- “Charles Worcester Dies Friday in Chicago Hospital,” Daily Mining Gazette, 24 March 1956.
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