Dyfyniad APA

Packard, A. S. (1987). Treatise on injurious and beneficial insects to crops (2.). Logos Press.

Dyfyniad Arddull Chicago

Packard, A S. Treatise on Injurious and Beneficial Insects to Crops. 2. New delhi: Logos Press, 1987.

Dyfyniad MLA

Packard, A S. Treatise on Injurious and Beneficial Insects to Crops. 2. Logos Press, 1987.

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