1. Audubon, J. J. (1826). The birds of America from drawings made in the United States and their territories. Retrieved from
https://play.google.com/books/reader?printsec=frontcover&output=reader&id=cO1PAAAAYAAJ&pg=GBS.PP1
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2. Audubon, J. J. (1831). Ornithological biography, or an account of the habits of the birds of the United States of America; Accompanied by descriptions of the objects represented in the work entitled the birds of America and interspersed with delineations of American scenery and manners. Retrieved from
https://play.google.com/books/reader?printsec=frontcover&output=reader&id=E7slAAAAMAAJ&pg=GBS.PP1
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3. Audubon, J. J. (1835). Ornithological biography, or an account of the habits of the birds of the United States of America; Accompanied by descriptions of the objects represented in the work entitled the birds of America and interspersed with delineations of American scenery and manners. Retrieved from
https://play.google.com/books/reader?printsec=frontcover&output=reader&id=CkU3AQAAMAAJ&pg=GBS.PP1
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4. Audubon, J. J., & Bachman, J. (1846). The viviparous quadrupeds of North America. Retrieved from
https://play.google.com/books/reader?printsec=frontcover&output=reader&id=6bZCAAAAYAAJ&pg=GBS.PP1
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5. Audubon, L. G. B., Audubon, J. J., & Buchanan, R. W. (1868). The life of John James Audubon : The naturalist. Retrieved from
https://play.google.com/books/reader?id=3XwZAAAAYAAJ&printsec=frontcover&output=reader&hl=en&pg=GBS.PP1
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