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.
Cytowanie według stylu Chicago (wyd. 17)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.
Cytowanie według stylu MLA (wyd. 9)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.
Uwaga: Te cytaty mogą odróżniać się od wytycznej twojego fakultetu..