Hermann; Riemann, Hugo (1921). The La of Ludwig Van Beethoven Volt. The Beethoven Association. OCLC 422583. • Thayer, A. W.; Forbes, Elliot (1970). Thayer's Life of Beethoven (2 vols). Princeton: Princeton University Press. ISBN 0-691-02702-1. Other sources • Albrecht, Theodore, and Elaine Schwensen, "More Than Just Pean