found: Ella, J. Musical sketches, abroad and at home, 1869:t.p. (John Ella)
found: OCLC database, Nov. 16, 1999(hdg.: Ella, John, 1802-1888; usage: Professor Ella)
found: New Grove(Ella, John; b. Dec. 19, 1802, Leicester; d. Oct. 2, 1888, London; English violinist, conductor and critic)
found: Grove Music online, 30 Mar. 2015(John Ella; born 19 December 1802 in Leicester; died London, 2 October 1888 in London; English concert manager and critic; in the early 1820s he began working as a violinist at the Philharmonic Society, Concerts of Ancient Music, and Royal Italian Opera; from 1860 to 1868 was director of the Musical Union Institute; in 1871 he was appointed professor of music at the London Institution, where he had delivered lectures since 1855; his published writings include "Musical sketches, abroad and at home" and "Lectures on dramatic music and musical education)