@misc{Kühling_O._Handbuch,
 author={Kühling, O.},
 howpublished={online},
 publisher={Oppenheim},
 language={ger},
 type={książka},
 type={dokument piśmienniczy},
 title={Handbuch der stickstoffhaltigen Orthocondensations-Producte},
}