Appelton's Cyclopaedia of American Biography. vol. 5. New York: D. Appleton and Company, 1887-1889. [includes information on Ridgely's ship and shore assignments]
Callahan, Edward W. List of Officers of the Navy of the United States and of the Marine Corps From 1775-1900. New York: Haskell House Publishers, 1969.
Hyamson, Albert M. A Dictionary of Universal Biography of All ages and of all Peoples. New York: E.P. Dutton, 1916.