@misc{Köstlin_Julius_(1826-1902)_Luthers,
 author={Köstlin, Julius (1826-1902)},
 address={Leipzig},
 howpublished={online},
 publisher={Fues's Verl. (R. Reisland)},
 language={ger},
 type={książka},
 title={Luthers Leben},
}