Öhlberger, Karl (Winter 1991). "Beethoven and the Bassoonist August Mittag". The Double Reed, Vol. 14, No. 3 (in German and English). Translated by John G. Cale. International Double Reed Society. Archived from the original on 2007-10-14. Retrieved 2008-01-20.
web.archive.org
Öhlberger, Karl (Winter 1991). "Beethoven and the Bassoonist August Mittag". The Double Reed, Vol. 14, No. 3 (in German and English). Translated by John G. Cale. International Double Reed Society. Archived from the original on 2007-10-14. Retrieved 2008-01-20.
