Schweisheimer, Waldemar (July 1945). "BEETHOVEN'S PHYSICIANS". The Musical Quarterly. 31 (3): 289–298. doi:10.1093/mq/xxxi.3.289. [1] Alirita la 19an de marto 2018. "Beethoven was the friend of Franz Gerhard Wegeler from early youth." (subskribo postulita)
