Naval Historical Center Web site (operated by the U.S. Navy)
"Officers of the Continental and U.S. Navy and marine Corps, 1775–1900/ US Navy Officers: 1798–1900—"R", accessed October 19, 2006
sfmuseum.org
Sfmuseum.org, "San Francisco Streets Named for Pioneers"
tridget.com
Tridget.comArchived 2006-11-25 at the Wayback Machine, The Lardners – Part One: From England to Michigan. Updated 25 March 2006", accessed October 19, 2006
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Lib.edul.edu, Mentioned in an engraving that is part of a collection at the University of Delaware. Web page titled "Henry Clay Presentation Items" describing "Henry Clay presentation items" in the library's Special Collections Department. Description reads: "Engraving of a bust of Henry Clay. Inscription reads: 'Engraved by W.H. Dougal, by permission for the Use of Congress, from a Bust by H.K. Brown of N.Y. in the possession of Cadwalader Ringgold, U.S.N. Daguerreotype by Whitchurst. Washington, D.C. 1852.' ”, Web page accessed October 19, 2006
web.archive.org
Tridget.comArchived 2006-11-25 at the Wayback Machine, The Lardners – Part One: From England to Michigan. Updated 25 March 2006", accessed October 19, 2006