Strong, R. M. (1939). A bibliography of birds; with special reference to anatomy, behavior, biochemistry, embryology, pathology, physiology, genetics, ecology, aviculture, economic ornithology, poultry culture, evolution, and related subjects. s.n.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Strong, Reuben Myron. A Bibliography of Birds; with Special Reference to Anatomy, Behavior, Biochemistry, Embryology, Pathology, Physiology, Genetics, Ecology, Aviculture, Economic Ornithology, Poultry Culture, Evolution, and Related Subjects. [Chicago: s.n, 1939.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Strong, Reuben Myron. A Bibliography of Birds; with Special Reference to Anatomy, Behavior, Biochemistry, Embryology, Pathology, Physiology, Genetics, Ecology, Aviculture, Economic Ornithology, Poultry Culture, Evolution, and Related Subjects. s.n, 1939.