@misc{Hennig_Richard_Buch,
 author={Hennig, Richard},
 howpublished={online},
 publisher={Verlag von Otto Spamer},
 language={niemiecki},
 type={podręczniki akademickie},
 title={Buch berühmter Ingenieure},
 keywords={technika - historia, inżynieria - historia},
}