@misc{Walther_Johannes_(1860-1937)_Einführung,
 author={Walther, Johannes (1860-1937)},
 address={Berlin},
 howpublished={online},
 publisher={J. Springer},
 language={ger},
 title={Einführung in die deutsche Bodenkunde},
 type={książka},
 keywords={geologia, Gleby},
}