@misc{Hartwig_Helena_Walenty,,
 author={Hartwig, Helena},
 howpublished={online},
 title={Walenty, Ludwik i Edward Hartwig},
 type={fotografia},
 keywords={Hartwig, Edward (1909-2003), Hartwig, Ludwik (1883-1975), Hartwig, Walenty, Lublin},
}