@misc{Welin_Riesengebirge,,
 author={Welin},
 address={Oldenburg in Holstein},
 howpublished={online},
 publisher={Kunstverlagsanstalt Julius Simonsen},
 language={ger},
 title={Riesengebirge, der Kochelfall},
 keywords={grafika niemiecka, wodospady, akwaforta, Karkonosze, widoki},
}