@misc{Heyke_Leon_(1885-1939)_[List,
 author={Heyke, Leon (1885-1939)},
 howpublished={online},
 language={pol},
 type={druk rękopiśmienny},
 title={[List Leona Heyke do Redakcji "Gryfa"], 1912.05.12},
}