Black, G. (1992). Iowa birdlife. Published for the Nature Conservancy by the University of Iowa Press.
Chicago Style (17. basım) AtıfBlack, Gladys. Iowa Birdlife. Iowa City: Published for the Nature Conservancy by the University of Iowa Press, 1992.
MLA (9th ed.) AtıfBlack, Gladys. Iowa Birdlife. Published for the Nature Conservancy by the University of Iowa Press, 1992.
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