@misc{_Photographic,
 howpublished={online},
 publisher={Bruno Machtans},
 type={postcard},
 title={Photographic postcard, Hindenburg in Zoppot},
 title={Pocztówka fotograficzna, Hindenburg in Zoppot},
 keywords={Postcard, Grafic desing, Museum collections, Sopot Museum},
}