@misc{Dr._E._Mertens_&_Cie_(Berlin)_Schloss,
 author={Dr. E. Mertens & Cie (Berlin)},
 address={Wernigerode},
 howpublished={online},
 publisher={Verlag Fridrich Gottsched},
 language={ger},
 title={Schloss Wernigerode - Portal},
 type={fotografia},
}