@misc{Edwards_Joseph_(1854–1931)_Nature_[ca,
 author={Edwards, Joseph (1854–1931)},
 volume={1},
 copyright={Public Domain},
 address={New York},
 howpublished={online},
 year={[ca 1954]},
 publisher={Chelsea Publishing Company},
 language={eng},
 title={Nature of the Problem. Preliminary considerations.},
 type={Text},
 URL={http://rcin.org.pl/Content/154020/PDF/WA35_187489_11772-1_1.pdf},
 keywords={Rachunek elementarny. [KABA]},
}