Schröder, J. H. The History of the Erard Piano and Harp in Letters and Documents. 1785–1959. Band 1: Inventions, Business, Composers and Performers. Band 2: Erard Family Correspondence: Hrsg. Von Robert Adelson, Alain Roudier, Jenny Nex, Laure Barthel Und Michel Foussard. mf 2024, 70, 58-59.