@misc{Gumowski_Jan_(1883-1946)_Cracow,
 author={Gumowski, Jan (1883-1946)},
 howpublished={online},
 publisher={Fr. Zieliński i Sp.},
 language={eng},
 title={Cracow [...]},
 type={plakat},
 keywords={Kraków (region), plakaty polskie, turystyka},
}