Black, G. (1992). Iowa birdlife. Published for the Nature Conservancy by the University of Iowa Press.
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Chicago Style (17th ed.) Zitazioa
Black, Gladys. Iowa Birdlife. Iowa City: Published for the Nature Conservancy by the University of Iowa Press, 1992.
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MLA (9th ed.) Zitazioa
Black, Gladys. Iowa Birdlife. Published for the Nature Conservancy by the University of Iowa Press, 1992.
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Kontuz: berrikusi erreferentzia hauek erabili aurretik.