Packard, A. (1880). Guide to insects: And a treatise on those injurious and beneficial to crops for the use of colleges, farm schools and agriculturist (7th edition.). Henry Holt and Company.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Packard, A.S. Guide to Insects: And a Treatise on Those Injurious and Beneficial to Crops for the Use of Colleges, Farm Schools and Agriculturist. 7th edition. New Delhi: Henry Holt and Company, 1880.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Packard, A.S. Guide to Insects: And a Treatise on Those Injurious and Beneficial to Crops for the Use of Colleges, Farm Schools and Agriculturist. 7th edition. Henry Holt and Company, 1880.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.