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"Adolph S. Ochs Dead at 77; Publisher of Times Since 1896." New York Times April 9, 1935. Available online.

Albert Fink papers, 1850-1893. mm 78020578, Library of Congress Manuscript Division, Washington, DC. Online catalog.

Andrew Shoch and Family Papers, 1853-1953. Minnesota Historical Society, St. Paul, MN.

Anneke Fritz (1818-1872) and Mathilde Franziska (1817-1884). Papers, 1791-1884. Wisconsin Historical Society, Madison, WI. Finding aid.

Charles Best, Jr. Papers (1874-1917). Wisconsin Historical Society.

Corporate Archives. Guardian Life Insurance Company, New York, N.Y..

Corporate Archives Carl Zeiss. Jena, Germany. Digital collections.

Data Relating to the History of the Firm of H. Hackfeld & Co., Limited. Manuscript H00055, C. Kasten, compiler. Hawaiian Rare Manuscript Collection, University of Hawaii at Manoa. Finding aid.

Emigration from Southwest-Germany. State Archive Baden-Württemberg, Germany. Online database.

Emile Berliner and the Birth of the Recording Industry. Library of Congress. Finding Aid.

F. W. Dohrmann Family Papers. BANC MSS 91/29 c, The Bancroft Library, University of California, Berkeley. Finding aid.

F.W. Dohrmann and B. Bickel Papers. MS 460, Library of the California Historical Society, San Francisco, CA.

Frederick Rauh & Company Records, 1837-1995. MSS BC 027, Cincinnati Museum Center, Cincinnati, OH.

Handbook of The Benjamin Altman Collection. New York: The Metropolitan Museum of Art, 1914.

"Henry Timken." The Hub 37.8 (Nov. 1895): 1.

Henry Villard Papers (MS Am 1322). Houghton Library, Harvard University. Finding aid.

Herbert H. Lehman Collections. Rare Book & Manuscript Library, Columbia University in the City of New York. Finding Aid.

Hihn-Younger Archive. Special Collections, University Library, University of California at Santa Cruz. Digital Collections.

"History of the House of H. Hackfeld & Co." Hawaiian Almanac and Annual for 1902 28 (1901): 43–54.

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