@misc{Thormälius_Gustav_Beethoven,
 author={Thormälius, Gustav},
 address={Bielefeld},
 address={Leipzig},
 howpublished={online},
 publisher={Verlag von Velhagen & Klasing},
 language={pol},
 type={książka},
 title={Beethoven},
 keywords={Beethoven, Ludwig van (1770-1827)},
}