Heyworth, Peter and John Lucas. "Klemperer, Otto", Grove Music Online, Oxford University Press, retrieved 17 July 2014 (subscription required)Archived 24 December 2022 at the Wayback Machine
Heyworth, Peter and John Lucas. "Klemperer, Otto", Grove Music Online, Oxford University Press, retrieved 17 July 2014 (subscription required)Archived 24 December 2022 at the Wayback Machine