@misc{Edwards_Joseph_(1854–1931)_Mean_[ca,
 author={Edwards, Joseph (1854–1931)},
 volume={2},
 copyright={Public Domain},
 address={New York},
 howpublished={online},
 year={[ca 1954]},
 publisher={Chelsea Publishing Company},
 language={eng},
 title={Mean values},
 type={Text},
 URL={http://www.rcin.org.pl/Content/191866/PDF/WA35_224430_11772-2_Chap36.pdf},
}