New Grove (Leonhardt, Gustav (Maria); b. 5-30-28, 's Graveland, Netherlands; Dutch harpsichordist, organist and conductor)
Dutch Wikipedia WWW site, Jan. 17, 2012 (Gustav Leonhardt; b. May 30, 1928, 's-Graveland; d. Jan. 16, 2012, Amsterdam; Dutch harpsichordist, organist, and conductor)
Library of Congress Name Authorities viewed 13 November 2016: (Leonhardt, Gustav, 1928-2012)