Packard, A. Guide to the study of insects and a treatise on those injurious and beneficial to crops for the use of colleges, farm-schools, and agriculturists. Henry Holt.
Lua i Stíl Chicago (17ú heag.)Packard, A.S. Guide to the Study of Insects and a Treatise on Those Injurious and Beneficial to Crops for the Use of Colleges, Farm-schools, and Agriculturists. New York: Henry Holt.
Lua MLA (9ú heag.)Packard, A.S. Guide to the Study of Insects and a Treatise on Those Injurious and Beneficial to Crops for the Use of Colleges, Farm-schools, and Agriculturists. Henry Holt.
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