LC data base, 3-12-86 (hdgs.: Trevelyan, George Otto, Sir, bart., 1838-1928; Trevelyan, George Otto, Sir, 1838-1928; usage: Sir George Otto Trevelyan; G.O. Trevelyan)
Oxford dictionary of national biography online, 10 January 2011 (Sir George Otto Trevelyan, second baronet ; politician and author ; born 20 July 1838 at Rothley Temple, Leicestershire ; died at Wallington 17 August 1928)