@misc{Hunter_George_W._(1873–1948)_Problems_[cop.,
 author={Hunter, George W. (1873–1948)},
 copyright={Public Domain},
 address={New York},
 howpublished={online},
 year={[cop. 1940]},
 publisher={American Book Company},
 language={eng},
 type={Text},
 title={Problems in biology},
 URL={http://www.rcin.org.pl/Content/138590/PDF/WA488_173604_2019728_Problems-in-biology.pdf},
 keywords={Biology, Biology - living creatures and their surroundings - plant food - human relations to other living creatures},
}