@misc{Packard_Alpheus_Spring_(1839–1905)_Guide_1869,
 author={Packard, Alpheus Spring (1839–1905)},
 copyright={Rights Reserved - Free Access},
 address={Salem},
 howpublished={online},
 year={1869},
 publisher={Naturalist's Book Agency},
 language={pol},
 title={Guide to the study of insects, and a treatise on those injurious and beneficial to crops: for the use of colleges, farms-schools, and agriculturists},
 type={Text},
 URL={http://www.rcin.org.pl/Content/48057/PDF/wa488_3639_1376_packard-guide.pdf},
}