James Duncan Gatewood, « William Longshaw Jr., Assistant Surgeon, United States Navy (1839-1865): A biographical sketch », United States Naval Medical Bulletin, vol. 7, no 3, , p. 503 (lire en ligne, consulté le )
The Boston Directory, Sampson & Murdock, (lire en ligne), p. 285
« Obituaries: Thomas C. Finnell, M.D. », Proceedings of the Connecticut Medical Society, vol. 4, no 1, , p. 276 (lire en ligne, consulté le )
(en) Maverick Congregational Church (East Boston Mass.), Condensed History and Manual of Maverick Congregational Church, East Boston, Mass., from Its Organization, May 31st, 1836 to June 30th, 1894, Maverick Congregational Church, (lire en ligne)
American Pharmaceutical Association, « Roll of Members », Proceedings of the American Pharmaceutical Association at the Tenth Annual Meeting, , p. 269 (lire en ligne, consulté le )
« New Destroyer Bears Name of Heroic Medic Alumnus », The Michigan Alumnus, vol. 48, , p. 262 (lire en ligne, consulté le )
Charles Wilkes, « Report of Commodore Wilkes...(July 28, 1862) », Official Records of the Union and Confederate Navies in the War of the Rebellion, vol. 7, no North Atlantic Blockading Squadron, , p. 626 (lire en ligne, consulté le )
Gustavus Richard Brown Horner, Diseases and injuries of seamen: with remarks on their enlistment, naval hygiene, and the duties of medical officiers, Philadelphia, Lippincott, Grambo & Co, (lire en ligne), p. 14
issuu.com
Andre B. Sobocinski, « A Case for Dr. Longshaw », The Grog: A Journal of Naval Medical History and Culture, no 20, , p. 4 (lire en ligne, consulté le )
jstor.org
Robert J. Schneller, « A Littoral Frustration: The Union Navy and the Siege of Charleston, 1863-1865 », Naval War College Review, vol. 49, no 1, , p. 38–60 (JSTOR44637808)
« THE HAYES ARCTIC EXPEDITION.; Letter from Dr. Hayes to the New-York Committee--Interesting Narrative by Surgeon Longshaw... », The New York Times, , p. 8 (lire en ligne, consulté le )